20.The old scientist made another great discovery, ______ of great importance to science.

A.which I think　　　　　　 B.which I think is　　　　　　 C.which I think it is　　　　　 D.I think which

19.A cook will be immediately fired if he is found ______ in the kitchen. (2003·NMET)

A.smoke　　　　　　　　 B.smoking　　　　　　　　　 C.to smoke　　　　　　　　 D.smoked

18.She wants to make friends with ______ shares her interests.

A.whoever　　　　　　　　　　 B.anyone　　　　　　　　　　　　　 C.whichever　　　　　　　 D.those

17.Fourtunately we had a map, ______ we would have got lost.

A.in which　　　　　　　　　　 B.with which　　　　　　　　　　 C.which　　　　　　　　　　　 D.without which

15.You can never imagine what great trouble I have ______ the patients who recovered serious

　wounds.

A.to treat　　　　　　　　 B.treat　　　　　　　　　　　　 C.treated　　　　　　　　　　　　　 D.treating

a became the 143rd member of the WTO on December 11th, 2001, thus ___ its 15-year

　 wish to join the global trade body.

A.realized　　　　　　　 B.realizing　　　　　　　　　 C.to realize　　　　　　　　 D.having realized

14.The robber was brought in, with his hands ______ behind his back.

A.tied　　　　　　　　　　　　　　 B.having tied　　　　　　　　　　 C.to be tied　　　　　　　　 D.being tied

13.The child has ______ a bad habit of getting up late on Sundays.

A.fallen into　　　　　 B.fallen in　　　　　　　　　 C.fallen over　　　　　　　　　　 D.fallen on

12.Kate ______ as a top student in painting.

A.looks out　　　　　　　　　 B.stands out　　　　　　　 C.works out　　　　　　　 D.finds out

11.Your letter ______ the days when we worked together on the farm 20 years ago.

A.called back　　　　 B.called up　　　　　　　　 C.called in　　　　　　　　　 D.called for

10.John is taller than _______ in his class.

A.other student　　　　　　 B.any students　　　　　　　　　 C.any other student　　　　　 D.any student