Next week, strangers with a truck will take away everything we own, except the clothes on our backs, the car we will drive, and as much stuff as we can pack into it. It's called moving. Some people do it often. For others, like me, it's a rare experience. In all my adult years, I've moved only three times.

My first husband and I moved into our first house with a bed, our clothes and a few gifts. That was a lifetime ago. Over the years, I filled that house with three children, a few dogs and enough stuff to reach the ceiling.

When the kids grew up, I lost my husband to cancer, and I began to learn about letting go. First, I let go of the idea of being in control. Life isn’t about being in charge of what happens; it's about being in charge of what we do with it. Next, I let go of putting off the things I care most about, like keeping in touch with the people that mean the most to me. I let go of the people whose lives are about anger or hatred, and tried instead to surround myself with those who shine with kindness. Finally, I let go of being alone---I remarried. I eventually moved to a new city with my new husband, and after that move, I promised I'd stop collecting meaningless things. But 12 years later, here I am, still learning about letting go.

Yesterday, while cleaning out a dresser, I found a box filled with old keepsakes. Nothing in that box may mean much to anyone, except me. They are treasures for me because of the memories they preserve. We finally decided to keep them, hold them close and never let them go. We’ll all move someday from this world to the next, but we won't need a truck to do it. We'll take nothing with us and leave behind a memory of the life we lived, the mistakes we made, and all the love and kindness we tried to show. That memory might not be a treasure, but if we're lucky, someone will keep it and hold it close and never let it go.

   Of all my dreams, my least favorite is the one where I'm in a car. It always begins with me driving, but eventually I realize that for some reason I'm sitting in the back seat. I can’t keep the car under control, rushing toward the roadside until, screaming, I wake up.

This is like the passenger experience in Waymo's self-driving cars. You sit in the back seat of a vehicle and watch as the wheel turns itself above an entirely empty driving seat.

''We made you live your nightmare, '' a Waymo staff member joked after I exited one of the company's fully self-driving car, following a quick drive inside its secret testing site. Waymo, a self-driving car company, arranged these rides for 40 journalists at this site.

There were also some demonstrations(演示). We watched as a Waymo car was cut off by a speeding vehicle. Then the employees created a situation in which a pile of moving boxes fell into the street just as another car passed in the opposite direction. Throughout the day, the cars performed impressively, driving with the level of care you might take if you had a wedding cake in the back seat.

During these demonstrations, Waymo gave information about what it was planning to do with these vehicles. The company has laid out four ways that its technology could be made available to the public. But Waymo's CEO, John Krafcik, wouldn’t show which of these was likely to come to market first, or on what kind of timeline.

I can't help but admire that Waymo is succeeding in developing this technology. There are countless possibilities at play on the road. The task of programming software to react to all those situations is unimaginably complex. What a great breakthrough!

As we all know, most of us school students feel somehow nervously whenever we’re taking an exam. There is no doubt whether exams are important to us, but it was also of great importance to have a right attitude towards them. As the matter of fact, exams are no more than a means of evaluation. However there is no need to worry too many about the results. Only by studying hard every day and make good preparations can we avoid suffering from the pressure of exam.

We had better to go out for a walk before exams. In addition, having enough sleep could make us full of energy and make possible for us to perform well in the exams.