If you like, ____ at any time.
| A．call on | B．drop in | C．visit | D．pay a visit to |
.
___ is known to us all is that the 2010 World Expo will take place in Shanghai.
| A．It | B．What | C．As | D．Which |
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We decided to turn to ___ can help us out.
| A．whoever | B．anyone | C．someone | D．whomever |
.
--- What do you think made Mary so upset?
--- __ her new bicycle.
| A．Losing | B．Lost | C．Because of losing | D．As she lost |
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They ___ out because the light’s on. Let’s go upstairs and have a look.
| A．mustn’t go | B．can’t have gone | C．couldn’t go | D．might have gone |
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I think ___ necessary ___ a foreign language.
| A．that; learning | B．it; to learn | C．that’s; to learn | D．it’s; learn |