Public service ads, also PSAs, often _________ for free, _________ to educate people about health, safety or any other problem that affects public welfare.
| A．run; meant | B．are run; are meant |
| C．are run; mean | D．run; are meant |
相关试题
Over the past 20 years, the Internet helped change our world in _____way or another for the better.
| A．any | B．one | C．every | D．either |
----That kind of computer is far too expensive.
----- I’ll buy one, ______ .
| A．though | B．so | C．either | D．too |
----Greg should have left the party an hour ago.
------ yes, I keep telling him to go, _____ he stays any way.
| A．because | B．but | C．instead | D．however |
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