School bus (safe) is a big problem in China.
Tan Dun's music Water, which is full of the sounds of nature, is listening to.(值得)
The temperature in our hometown usually drops zero in winter. (在……以下)
Follow these small , and you can make a big difference to the Earth.(步骤)
Knowledge is a treasure, but practice is the to it. (钥匙)
当我们处于困境时,我们不应该放弃.
We shouldn't when we are in trouble.