二、单项填空（共15分）
21. ---I’m sorry I shouldn’t have laughed at you the day before.
--- _________ .
| A．My pleasure | B．Thanks | C．Take it easy | D．Forget it |
On AIDS Day, the minister of Health Department demanded that the problems ______ paid special attention to.
| A．referred to being | B．referred to be |
| C．refer to being | D．refer to be |
The shop has been standing so ______ that a thief finds nothing to steal.
| A．quietly | B．lonely | C．empty | D．Open |
They talked for about an hour of things and persons ______ they remembered in the school.
| A．which | B．that | C．who | D．whom |
--Is it all right if I use your car ?
----
| A．It depends | B．Go ahead |
| C．Got it. | D．I don’t care |
Our school has developed a learning system students can do a lot of teamwork.
| A．that | B．when | C．which | D．where |