用所给动词的适当形式填空。

1. By the time I ______ ( get ) home, Mother ______ ( finish ) cooking.

2. _______ you _______ ( listen )to tapes yet?   No. I _______ (listen) in an hour.

3. You are interested in       (drawing). You might _____ (become) an artist in the future.

4. What ______ your little brother ______( do )? Don't speak so loud. He _______.( sleep )

5. The new teacher who _______ ( teach ) us chemistry ______ just_____ ( walk ) into the classroom.