As the saying goes, time is money. And in my opinion, time is even precious than money. Why? Because when money is spent, we still have a chance to earn them back. But when time is wasting, we can never get it back. There is no doubt whether time is very limited, and even a minute is of great value. We should make fully use of time to do what should be done. It’s the pity that a lot of people still didn’t appreciate the value of time. They are wasting their time doing nothing of useful. We should form the good habit of race against time and make a difference in our world.

   When it comes to exercise，most of us fit into one of the two groups — those who keep a regular exercise habit and those who think about being more active but can’t seem to have a plan to do it consistently. Whatever your attitude to exercise，there’s another form of physical activity that many of us car-loving people can do to get enough movement in general.

Studies have shown that putting away your car and walking, biking or taking public transport to work can have a significant positive influence on your health by improving spirits, reducing body weight and lowering the risk of heart disease.

It’s not surprising that taking a bus or a train regularly leads to a more physically active lifestyle. Just think about what comes with using public transport. Those who travel to work without a car walk to stations, climb stairs, often stand while waiting for their bus or train, and then finally travel on foot or by bicycle to their destination. Such active transport can make up for the inactive time spent in work and school environments.

There’s no doubt that the improving public transport system in the city is influencing the way people work and live. But though the public transport system is improving, it is not within easy reach of everyone who would like to use it.

Bike-sharing programs are also growing in popularity（普及）and helping to bridge a gap in the crowded city public transport system. These programs allow users to easily book, ride and return a borrowed bike. Bike-sharing programs help people who might still need to travel some distance between the end of the bus or the underground line and their final destination. They also offer an opportunity to residents and visitors to travel freely around the city without being trapped in a car.

   It's said that you don't know a man until you walk a mile in his shoes. And you also don't know what it's like for old people to travel until you accompany（陪伴）one on a trip.

After flying with my elderly father from Washington, D.C.to L.A.in July, I began to realize that a companion has important tasks that can make a journey easier for old people. I booked nonstop tickets on JetBlue to avoid tiring, confusing connections, and we flew directly into Long Beach Airport. Even though my father could walk, I arranged with the airline for wheelchair assistance, which meant we got on board first.

When I took him back to the airport for his return flight to Washington, I got permission from JetBlue to wait with him at the gate instead of saying goodbye at the security checkpoint. I wished he'd had a first-class seat and access to a comfortable airline club. Better yet, I wished I had flown with him on both ways. As I watched the attendant wheel him to the lift that would take him from the tarmac（停机坪）to the plane, I felt like an anxious mom sending her child to school for the first time.

Things can go awry on a plane trip. And then there is a horrifying story about Joe and Margie. When they landed at Dallas-Fort Worth International Airport, a wheelchair attendant met them to help with a connection. But somehow Margie, who had Alzheimer's disease, disappeared.

I didn't need to worry about my father's wandering away；at 82, his mind was sharper than mine. But his hearing was poor, so I worried about what would happen if he missed an important announcement.

Fortunately, everything went just fine. A good arrangement（安排）made the trip successful.

Next time I travel with a senior, I'll know better. I hope there will be a next time.

   So let’s say that you’re sitting at a restaurant and when your food arrives, you take one bite and decide that something is preventing you from taking a second bite. No matter what the reason is, this dish is going back to the kitchen, and now it’s up to you to find a way to send it back politely.

First of all, the single most important thing to do when you’re sending something back is to do it immediately. If you eat half the dish before sending it back, the server and kitchen will believe that you really don’t need to send it back.

If a dish is too salty that it cannot be eaten, you should first let the server know what the situation is, and they’ll take it back to the kitchen and bring you a new one. Remember that it is not the server’s fault, so don’t take it out on them. Also, don’t be afraid that they’ll get angry at you, or someone will spit (吐) in your food. It’s their job to make sure that you’re satisfied, and if the kitchen clearly makes a mistake the server will be frustrated with the kitchen, not with the diner who has been served an inedible meal. A new dish will be cooked, and nobody’s going to spit in it.

There is, however, one example when you are sending back a dish which will really annoy both the server and the kitchen. If you order a pasta dish that contains pancetta but then send it back to the kitchen because you’re a vegetarian (素食者) and don’t know what pancetta is, and then congratulations because you’re one of the most unbearable types of customers a restaurant can have. A perfectly good plate of food is just thrown out because you don’t ask what pancetta is before ordering.

So the bottom line: Use common sense if you think that you need to send your dish back. If the kitchen do something wrong, then they’re on the hook for a new plate of food. If you do something wrong, then hopefully you’ve learned a lesson.