You’dbetter,Ithink,______himahandwhennecessary.

Yourbikeisbroken.You’dbetter()anewone. A: tobuy B: buy C: sell D: tosell

It is no good ________ all day. You'dbetter take some actions to change your situation. A: complain B: complaint C: complaining D: to complain

You’dbetter be careful. A: 你最好勇敢些。 B: 你最好小心。 C: 你最好关心一下。 D: 你有什么事需要关心。