3.Start out right away，or you'll miss the first train.

4.Work hard，and you will get promoted.

5.Don't be discouraged.Take (take) things as they are and you will enjoy every day of your life.

6.One more hour and we will__get (get) everything ready for the taking off.

7.Li Ming，read (read) the text - everybody else，listen carefully and see whether his pronunciation is correct.

8.Our English teacher is ill.Let's go and see him after school，shall we?

9.When you've finished with that book，don't forget to put it back on the shelf，will you?

10.Give (give) us ten years and just see what our country will be like.

Ⅱ.单句改错

1.Don't run around，won't you？won't→will

2.Let's have a nice talk face to face，shall you？you→we

3.Giving blood if possible and many lives will be saved.Giving→Give

4.Follow your doctor's advice，and your cough will get worse.and→or

5.Not be late again from now on.Not→Don't