__________ you keep on trying ,I don’t really mind whether you can come top in your class．
| A．The moment | B．As soon as | C．Once | D．So long as |
Rescuers are ______ for the safety of the two men trapped in the mine.
| A．grateful | B．concerned | C．extreme | D．frightened |
--- How many times have you been to China?
--- In fact, it is the first time that I ______ here.
| A．was | B．am | C．had been | D．have been |
Please ______ the numbers and I’m sure they will ______ more than 1, 000.
| A．add up; add to | B．add up; add up |
| C．add up; add up to | D．add to; add up |
The policemen had no ______ in finding the knife that the murderer had thrown.
| A．difficulty | B．troubles | C．problems | D．question |
An athlete can’t play balls well without severe ______.
| A．exercise | B．teach | C．education | D．training |