They were surprised that a child should work out the problem they themselves couldn’t．
| A．once | B．then | C．while | D．if |
Who do you think the teacher will ______ the question?
| A．have answer | B．have answered | C．have to answer | D．has answered |
The man will have to wait all day ______ the doctor works faster.
| A．if | B．unless | C．where | D．that |
With a lot of difficult problems ______, the newly-elected president is having a hard time.
| A．settled | B．settling | C．to settle | D．being settled |
I used to quarrel a lot with my parents, but now we _______ fine.
| A．look out | B．stay up | C．carry on | D．get along |
I don’t mind her criticizing me,but _______ is how she does it that I object to.
| A．it | B．that | C．this | D．which |