____________ you may have, you should gather your courage to face the challenge.
| A．However a serious problem | B．What a serious problem |
| C．However serious a problem | D．What serious a problem |
He walked ________ fast for us ________catch up with.
| A．so, that | B．such, that | C．enough, to | D．too, to |
_______ my mother ________ my sister watches TV plays these days.
| A．Either, nor | B．Both, and | C．Neither, or | D．Neither, nor |
The nurse doesn't feel well today, _________ she still works very hard.
| A．but | B．and | C．or | D．when |
Tom has been in the factory _________he left school.
| A．when | B．since | C．as soon as | D．whether |
He had _________ much work to do that he couldn't go out.
| A．so | B．such | C．as | D．or |