20、The advantage human beings have to       the sun is worth discussing.

A．take of    B．play with        C．have on  D．do with

19、        in 1864 in Geneva, Switzerland, the agreement was intended to protect the wounded solders and limit human suffering in time of war.

A．Signing                     B．Signed              C．Having signed        D．Being signed

18、While learning English, I experience similar difficulties       that most of you face.

A．as which        B．to those  C．to one     D．as those

17、In the dark forest       many lakes, some of       large enough to hold several English towns.

A．lie; which       B．lying; which    C．lie; them         D．standing; them

16、Shall we       our discussion and have some tea or coffee, please?

A．break out        B．break down    C．break into       D．break off

15、I like traveling. I       to Belgium five months ago, but I       anywhere ever since.

A．went; haven’t gone                                    B．went; didn’t go 

C．have been; don’t go                                  D．had been; haven’t gon

14、–I was so sure that our experiment was going to succeed, but something went wrong at the last moment.

--      , but don’t give it up.

A．You don’t mean that                                                                 B．Failure is the mother of success

C．I’m sorry to hear that                                      D．Never mind

13、      achievement, last week’s conference here earned a low, though not failing, grade.

A．For the sake             B．In case of          C．In terms of            D．On account of

12、Did _________ on time make her teacher angry.

A．not to come               B．her not to come   C．her not coming       D．not her coming

11、語音知識.

1．washed    A．wondered          B．decided              C．treated               D．watched

2．sink         A．season               B．usual                 C．promise             D．pleasant

3．police       A．magazine           B．line                    C．hesitate              D．medicine

4．Dangerous A．any                   B．magic                C．behave               D．travel

5．violin       A．period              B．biology                C．idiom                    D．pioneer