—Sorry, I can’t go camping with you. I have to get ready for tomorrow’s exam—______. We can do it together next time.
Last weekend, I _____ my washing machine ______.
The manager devotes all his spare time ______ the violin.
______ he returns to his native land.
This book _____ ten units, ______ three mainly revision.
____ speaking, a person must care much about his ____, because it is not only a personal thing, but also a social one.