The girl ________at the party yesterday is missing today.
| A．referring to | B．refer to | C．referred to | D．to refer 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 |
________the new computer, travellers at the offices of CAAC can now buy their air tickets much faster.
| A．Because | B．Thanks for | C．Thanks to | D．Since |