18、My aunt likes playing_________ violin at _________ night．

A．/；/           B．the；/          C．/；the              D．the；the

17、More than twenty _________ students are having an important exam at the moment．

A．thousands          B．thousands of           C．thousand             D．thousand of

16、--Whose tennis racket is this?

--Look! Jerry's name is on it! It _________ be his．

A．may           B．must            C．can't           D．mustn't

15、How much did you _________ for this trip?

A．take            B．spend                C．cost                D．pay

14、-- _________ have you practiced skating?

--For five years．

A．When          B．How long              C．How often           D．How soon

13、Most of the teachers in our school are _________ busy _________ take care of their own children．

A．so； to             B．so；that            C．too；to             D．enough；to

12、Would you mind _________ the TV? Your father is working now．

A．turning up          B．turning down         C．to turn up       D．to turn down