1. Mr. Smith gave up (放弃) smoking two years ago. (改为同义句)
    Mr. Smith ________ ________ two years ago.
2. You must be quick. If not, you'll miss the early bus. (改为同义句) 
    ________ quick, ________ you'll miss the early bus.
3. I don't know what I should do with the letter. (改为简单句)
    I don't know what ________ ________ with the letter.
4. My father asked, "Shall we go to work by bike everyday?" (改为宾语从句)
    My father asked ________ we ________ go to work by bike everyday.
5. "Don't play football on the street, little boys," the policeman said. (变成间接引语)
    The policeman told the little boys ________ ________ ________ football on the street.