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C: Ask him to apply again. D: Cancel his video card.

18(5分) : 第三次作业问题4 A: He must attend a class. B: He must meet his teacher.

C: He must go out with his girlfriend.

D: He must stay at school to finish his homework.

19(5分) : 第三次作业问题19

A: It takes a longer time to melt. B: It is lighter to carry.

C: It is not so cold as ordinary ice.

D: It is cleaner to use than ordinary ice.

20(5分) : 第三次作业问题7

A: He is attending his sick mother at home. B: He is on a European tour with his mother. C: He is in Europe to see his mother. D: He is at home on sick leave.