18、In Australia there are over 140 species of snakes, many of ______ are extremely dangerous.

       A．them           B．that             C．which             D．those

17、―Do you think it wise for parents to try to do everything for their children?

―No, that is just ______ they are mistaken.

       A．what              B．where           C．when              D．because

16、The fighting broke out on April 14, ______ 3 innocent people with more than 20      .

       A．killed; injured                              B．killing; injured

       C．killed; injuring                             D．killing; injuring

15、Lucy visited quite a few museums ______ her stay in England.

       A．during            B．a(chǎn)mong           C．while              D．since

14、―David wants to be another Yao Ming after he graduates from school.

―Are you joking? He will never ______ a person like Yao Ming.

       A．meet               B．get                C．turn                D．make

13、Henry,______ the experiment as I showed you just now, or you will not pass.

       A．do                    B．does               C．doing             D．done

12、Seeing the guard coming, away______.

       A．the two boys ran                      B．were the two boys running

       C．ran the two boys                     D．did the two boys run

11、There is no food left and the grocery stores are shut so you have to ______.

       A．go without       B．go out            C．go mad               D．go wrong

10、―Nobody will ever know who stole the car.

―I don't think so．The thief______ and is being questioned by the police.

       A．has caught                          B．has been caught

       C．is catching                          D．will be caught

9、―Did you attend your son's graduation ceremony yesterday?

― I______, but I had to go to an important meeting.

       A．used to          B．ought to           C．must have           D．should have