根据句子意思,用括号中所给单词的适当形式填空。

1. ---Sam usually spends three hours _______(do) his homework every day? What about you, Jack?

   ---  Two hours.

2. Thank you for _______(help) me clean the garden. I will spend the whole day without your help.

3. ---What's your favourite activities after school?

   ---I enjoy _________(dance) in the art room. 

4. ---Do you know a game ___________ (call) "trick or treat"?

   ---Yes. Children like to play it at Halloween.

5. ---What do you want to make with the pumpkin?

   ---We want to make a lantern for Halloween. Can you see the sharp _______ (tooth)?

世界上季风气候最显著的地区是[ ]

A．西亚

B．东亚

C．中亚

D．北亚