(2006年徐州)

Thanks ________ the Great Green Wall, the land produces more crops.

[　　]

You can play computer games sometimes, but you mustn't ________ too much time on it.

[　　]

(2006年重庆)

Your classroom is so dirty. Everyone should keep it ________.

[　　]

(2006年合肥)

--- Don't you think your radio is too noisy?

--- Yeah, I'll go and ask her to ________.

[　　]

We shall visit the Science Museum ________ next week.

[　　]

(2007年重庆)

Remember to ________ the lights when you leave your classroom.

[　　]

The weather turns ________ and the wind blows ________.

[　　]

The little girl often looks ________ the window in class.

[　　]

________ our surprise, he bought 20 hamburgers.

[　　]

(2006年吉林省)

--- ________ do you help your mother do the housework?

--- Once a week.

[　　]