Ⅰ单项选择题（15）：
( ) 1. –What good weather! Let’s go boating on the lake.
--_________.
A. That’s all right B. Thank you very much
C. It doesn’t matter D. That’s a good idea
( ) 2.You look tired. You’d better ____ a good sleep.
A. have B. having C. had D. to have
( ) 3.It’s important ____ the piano well.
A. of him to play B. for him to play
C. of him to playing D. for him playing
