The family is a cooperative enterprise for which it is difficult to _____ rules, because each family needs to work out its own ways to deal with its own problems.
| A．set up | B．put down | C．keep up | D．lay down |
Good food，not _________，that’s how one gets fat.
| A．enough exercises | B．exercises enough |
| C．enough exercise | D．exercise enough |
_________ is known to all，good friends _________ happiness and value to life.
| A．It； add | B．As； add | C．It； add up | D．As； add to |
Henry can’t attend the party _______ at Tom’s house at present because he is preparing the speech at the party _______ at Marie’s house tomorrow.
| A．held; being held | B．to be held; to be held |
| C．to be held; held | D．being held; to be held |
t will be quite a long time _______ she is back again, so don’t be too cross with her.
| A．that | B．since | C．before | D．until |
-How can I use this washing machine?
-Well, just refer to the _______.
| A．explanations | B．expressions | C．introductions | D．directions |