The machine requires _____, so the workers are required _____ ready.
| A．repair；to get | B．repairing；to get |
| C．repairing；getting | D．to be repaired；getting |
Young students are ______ not to smoke, either in or out of school.
| A．suggested | B．requested | C．hoped | D．invited |
The reason he was absent from class was his mother fell ill this morning.
| A．for; that | B．why; that | C．for; because | D．why; because |
The leader of the factory told us that very little ______ was made of the waste material in the past.
| A．cost | B．value | C．use | D．matter |
_____ of the students who took part in the military training is 450.
| A．A number | B．A lot | C．A few | D．The number |
—How many times have you been to China?
—In fact, it is the first time that I__________ here.
| A．was | B．have been | C．had been | D．am |