A.Have enough sleep

B.Keep yourself busy

C.Go out and make friends

D.Break the bad habit

E.Eat healthy food.

F.Remember to exercise

    Nothing is more important than health and happiness. But how can we live a healthy and happy life? Here are some ways for you.

    ____ Eat a lot of fruit and vegetables. They supply rich and the necessary vitamins for us. We also should eat less meat and junk food everyday.

    ____ Swimming, running, skating, dancing, walking and some other activities can help you keep healthy. You should exercise at least three times a week and for twenty minutes or more each time.

    ____ It is best to get about eight hours of sleep a day. It is hard for our health if we don't have enough sleep. You can get sick from not getting enough sleep.

    ____ It stops you from having bad habits. To keep yourself busy, you can walk around the house, spend with your pet, watering flowers, cleaning the windows and so on. Do anything you enjoy.

    ____ Spend time and have fun with them. Talk with them, but don't talk about anything bad. You should stay with the people who are healthy and happy.

已知函数f（x）=a^x﹣a^﹣x，（a＞1，x∈R）．

（Ⅰ） 判断并证明函数f（x）的奇偶性；

（Ⅱ）判断并证明函数f（x）的单调性；

（Ⅲ）若f（1﹣t）+f（1﹣t²）＜0，求实数t的取值范围．