—— What can I do for you?
——I’d like to buy a gift for my mother’s birthday, one at _________ proper price but of ___________ use and it’d better be __________ surprise.
| A．the; /; a | B．the; a ; / | C．a; the; / | D．a; / ; a |
.________ gas leaks and similar accidents should occur, some responsible persons should regularly inspect all the laboratories.
| A．Unless | B．In case | C．Provided | D．Until |
. ________ in one leg, he never had a chance to get a job.
| A．Weak and lame | B．He was weak and lame |
| C．Though weak and lame | D．Weak and lame as he was |
. The production of television commercials must be professional ________ they aim at promoting good service, or public education.
| A．when | B．no matter | C．if | D．whether |
. The prices have been going up, so that the richer you get, the less rich you are than ________ you think you ought to be.
| A．that | B．/ | C．what | D．which |
定语从句及其关系代词与副词
. Jane came to settle down in New York in , ________, some time later, she became a middle school teacher.
| A．where | B．when | C．at which | D．that |