There ______ some apples on the table. （   ）

A．is

B．am

C．are

—________ it cloudy yesterday?  (   )
—Yes, it was.

A．Were

B．Is

C．Was

I ______ going swimming. (  )

A．am

B．is

用所给词的正确形式填空。
【小题1】We should stop _________ (throw) rubbish into rivers.
【小题2】In the past, the Earth _________ (be) clean and beautiful.
【小题3】My brother is __________ (plant) trees in the backyard.
【小题4】The Earth __________(get) sick now.
【小题5】We shouldn’t __________ (cut) down so many trees.

用动词正确形式填空：be ( are, am, is)
1. I_____ (be) doing homework now.
2. Mike and John ______ (be) drawing pictures.
3. Amy ____ (be) reading a book.
4. We are __________ (write) an e—mail.
5. Zhang Peng is _________ (listen) to music.
6. They _____ (be) _____________ (answer) the phone.