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.