The question that puzzled them is ____ they can get rid of the air pollution in the area.
| A．how is it that | B．that is how | C．what is that | D．how it is that |
A number of high buildings have arisen ______ there was nothing a year ago.
| A．when | B．where | C．before | D．until |
It was reported that a little boy under a destroyed house for three days was pulled out alive at last.
| A．trapped | B．being trapped | C．was trapped | D．had been trapped |
Devoted to the rescue of the earthquake victims, the volunteers felt _____ but regret.
| A．anything | B．nothing | C．something | D．somehow |
----Mary broke up with me!
----You ______ have forgotten about the Valentine's Day．
| A．shouldn't | B．couldn't | C．needn't | D．mustn't |
Young people seem to have no time to spend with other people around them ______ giving so much attention to their own world.
| A．in spite of | B．regardless of | C．due to | D．according to |