选择单词的适当形式填空。
1. What are you _____? (do, doing)
--We are ______ lunch. (have, having)
2. The girl can _____. She likes _____. (dance, dancing)
3. The telephone is _______. (ring, ringing) Let me ______(answer, answering) it.
4. Are you ________ TV now? (watch, watching)
--No, I am ________ to music. (listen, listening)
5. I like ________, but I can’t _________ well. (skate, skating)