1. 给下列问句选择相应的答句。

① What are you doing?      A. No，she isn't.

② What is your mum doing?      B. Yes I am.

③ Can I use your pen?      C. I'm cleaning my room.

④ Is Sarah reading a book?      D. She is cooking fish.

⑤ Are yoy doing homework?      E. Sure.