三、用所给动词的适当形式填空：

　　1. Would you like __________ ( sing ) at the party?

　　2. Sorry, I kept you ____________ ( wait ) for me so long.

　　3. It was difficult for him ____________ ( give ) up smoking.

　　4. My parents want me ____________ ( be ) a teacher.

　　5. They will go fishing instead of ___________ ( swim ).

　　6. They decided ___________ ( not tell ) him the bad news.

　　7. They used to ____________ ( stay ) at home on Sundays.

　　8. ________ your mother ___________ ( wash ) clothes yet?

　　9. They __________ ( read ) books when the teacher came in.

　　10. Computers ____________ ( sell ) almost everywhere.

　　11. Thanks for _____________ (invite ) me.

　　12. What about _____________ ( skate ) on the ice?

　　13. What _____________ your mother __________ ( do ) every day?

　　14. Kate _____________ ( not fly ) kites now.

　　15. Keep quiet, please. They _____________ ( have ) a meeting.