21、The famous scientist, _______ a dinner party will be held tonight, is to arrive soon．

A．in honour of him                           B．in his honour 

C．in whose honour                          D．in which honour

20、How long do you think it will be ________ the computer company puts forward a new product?

A．before           B．since           C．until             D．that

19、By law, when one makes a large purchase, he should have _____ opportunity to change his mind．

A．accurate         B．adequate          C．urgent        D．excessive

18、_____ the front door ___     , he had to enter the room through the back door．

A．Seen, painted                                  B．Seeing, painted

C．Seeing, being painted                            D．Being seen, being painted

17、On hearing the news, the girl rushed out without hesitation, ___   the luggage ___   on the floor and ____ in the dark．

A．left, lied, disappeared                        B．leaving, lying, disappeared

C．leaving, lie, disappeared                           D．left, lay, disappear

16、I prefer a flat in the suburb to        in downtown , because I want to live near my Mom’s．

A．one          B．that          C．it               D．this

15、The driver got out of the car_______it caught fire．

A．directly         B．that          C．unless           D．until

14、－Can I pay the bill by check?

－Sorry, sir．But it is the management rule of our hotel that payment ______be made in cash．

A．shall            B．need             C．will          D．can

13、The scientists are able to ____________ accurately when the spaceship will reach the moon．

A．accumulate             B．calculate                 C．appoint              D．estimate

12、－You couldn’t have chosen a better way to solve the issue, I think．

－________________．

A．Well, nothing much                         B．Oh, don’t complain about it

C．Sorry, but I’ll find a better one                            D．Thanks a lot．