As a rule, domestic servants doing odd jobs are paid ______.
| A．by the hour | B．by hour | C．by an hour | D．by hours |
I have no doubt _____ he will get the first place in the competition.
| A．whether | B．if | C．that | D．About |
He’s given me so much help that I really want to do something for him _____.
| A．in turn | B．by turns | C．in return | D．in answer |
The heavy rain has lasted for several days and the river has______ by 30 centimeters.
| A．risen | B．raised | C．arisen | D．lifted |
It seems that the young man and the lady have little __________.
| A．in common | B．on common | C．at common | D．with common |
Do you know how many people ______ up to now?
| A．have invited | B．have been invited | C．had invited | D．had been invited |