The most exciting moment during the Spring Festival is _____ the family enjoy the big dinner together.

Could you please ________ the rubbish，Mandy—OK. I’ll do it right away.

While Helen ________ the piano，her mother came in．

The traditional view is ______ we sleepbecause our brain is “programmed” to make us do so.

19. If you are not sure _______ your strengths and weaknesses ______, you may ______ a professional expert so that you can develop yourself to the full.