His illness ________ his absence．So don’t scold him．
| A．showed | B．accounts for | C．explains | D．gives out |
—What do you think of the music teacher ?
—______ she is an attractive lady, she can be extremely difficult to work with．
| A．If | B．As | C．Because | D．While |
If you want to book tickets for the 2012 Olympic Games, just call 00952012．It ______ be simpler．
| A．mustn't | B．shan't | C．needn't | D．couldn't |
Would you be kind enough to help the boy _____ Chinese is really hard to learn?
| A．who | B．whose | C．for whom | D．from whom |
_____ in the library regulations that any book borrowed be returned by due time, or the borrower will be fined．
| A．What is required | B．It is required |
| C．As is required | D．Which is required |
—How did you like the concert last night ?
—I enjoyed it very much, but the dancers _____ a better job．
| A．could have done | B．must have done |
| C．could do | D．had done |