根据汉语意思填空：

把下面句子划线部分提问

They've been to China.

____ ____ they been?

把下面句子改成一般疑问句：

I can look at Lingling's photos.

____ ____ look at Lingling's photos?

把下面句子改成一般疑问句：

You have seen Lingling's photos.

_____ _____ seen Lingling's photos?

听录音填空

These 　　　　 are 　　 .

This jacket is 　　　　.

听录音完成对话：

B. It's 　　 . Look!

--Whose skirt is it?

--It is 　　 (I).

--　　　　 (who) hat is it?

--It is 　　 (she).

They are not my trousers. They are 　　　　 (you).