Visitors ________ not to touch the exhibits.
| A．will request | B．are requested |
| C．are requesting | D．request |
---- Don't you think it necessary that he _______ to Miami but to New York?
---- I agree, but the problem is ________ he has refused to.
| A．will not be sent; that | B．not be sent; that |
| C．should not be sent; what | D．should not send; what |
The place _______ the bridge is supposed to be built should be ________ the cross-river traffic is the heaviest.
| A．which; where | B．at which; which |
| C．at which; where | D．which; in which |
---- The woman biologist stayed in Africa studying wild animals for 13 years before she returned.
---- Oh, dear! She _______ a lot of difficulties!
| A．may go through | B．might go through |
| C．ought to have gone through | D．must have gone through |
In our childhood, we were often _______ by Grandma to pay attention to our table manners.
| A．demanded | B．reminded | C．allowed | D．hoped |
They _______ on the program for almost one week before I joined them, and now we ________ it as no good results have come out so far.
| A．had been working; are still working | B．had worked; were still working |
| C．have been working; have worked | D．have worked; are still working |