按要求改写句子。

1. Jim is playing basketball now. (改成否定句)

    Jim ___________ playing basketball now.

2. There are some books on the desk. (改成一般疑问句)

    ___________ there ___________ books on the desk?

3. Is Linda watching TV in her room? (作否定回答)

    No, ___________ ___________.

4. The students are singing under the tree. (对画线部分提问)

    ___________ are the students ___________ under the tree?

5. The little girl is talking to her mother. (对画线部分提问)

    ___________ is the little girl ___________ to?

6. Mary is watching TV now. (用every evening改成一般现在时)

    Mary ___________ TV every evening.

室内空气中氡测量的目的是普查、（）和剂量估算。