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.