1.it's very bad to spit on the ground.
2.Smoking is harmful to your health,but the walking is good for your health.
3.To eat many sweets are bad for your teeth.
4.It took me half an hour to fall asleep last night.
5.From lhasa to Shout and haothe plane took him a thousand yuan.
6.You'd better not go until your aunt arrives.
7.I want to know what's wrong with the animal.
8.Can you tell me how to go to the Summer Palace.
9.Before the operation he used to have a headache.
10.When I was young I often go hiking.
11.The bookshelf is used to put the books.
12.The knives are for cutting things.
13.He used to smoke.
14.Do you want him to call you?
15.I can't wait to open my bag.
16.The children can't wait to open and under the tree stockings inside the gift.
17.Let's hurry so that we can get there before supper.
18.My father lived in the distant place,so we are seldom seen him.
19.I bought a boat,so I could go fishing.
20.He walked too far,so feel quite tired.
终于翻译完了!比当初写作业还累!