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18、This is something really invisible,        ? 

A．is it            B．is this             C．isn't this            D．isn't it

17、If we expect         much cleaner world, we should attract         world's attention to protect it．

A．a; a                 B．a; 不填              C．a; the                D．the; 不填

16、People were not allowed to enter the reading room because it        ．

A．had been painted                           B．was being painted

C．was painting                                 D．painted

15、In China, peach is a         of long life and therefore makes an ideal birthday present．

A．symbol            B．sign               C．signal              D．symptom

14、Johnson had no choice but to have her baby         because of her financial problems．

A．adopted              B．adopt                 C．adapted              D．adapt

13、I have got two tickets for the coming football match, and I         my son to go to watch it．

A．take                 B．took                C．have taken                    D．am taking

12、—Sunny day, isn't it?

—Let's hope the sunny weather         for Saturday's tennis match．

A．carries on           B．moves on             C．goes up            D．keeps up

11、The village I grew up         was destroyed by the earthquake last year and is under construction now．

A．in             B．in it                C．in that              D．in which

10、Much to his surprise，he invited only twenty friends to the dinner, but         came．

A．twice as many as                          B．as many as twice 

C．twice as many                              D．twice more than

9、This time next week, that famous singing group         us a great performance in the stadium．

A．would give              B．will have given        C．will be giving           D．shall give