His success ____ the fact ____ he had been working hard.
| A．put in; which | B．led to; because | C．lay in; that | D．got in; that |
Please tell me how the accident _______．I am still in the dark．
| A．came up | B．came out |
| C．came to | D．came about |
It is______ of him to set his aim high but do little, so he is always leaving things undone．
| A．specific | B．typical |
| C．flexible | D．widespread |
— Do you think it's a good idea to make friends with your students？
—________, I do．I think it's a great idea．
| A．Really | B．Hopefully |
| C．Actually | D．Eventually |
Mary couldn’t________ the terrible working conditions in that factory and resigned last week．
| A．catch up with | B．keep up with |
| C．put up with | D．come up with |
Some passers-by witnessed the car accident ______ five passengers were killed, a baby included．
| A．where | B．which | C．that | D．when |