20.　 This printer is of good quality. If it ______ break down within the first year, we would repair it at our expense.

　　　 A. should　　　　　　　　　　 B. would　　　　　　　 C. could　　　　　　　　 D. might

19.　 Nobody believed his reason for being absent from the class ______ he had to meet his uncle at the airport.

A. why　　　　 　　 B. because 　　　　　 C. where　　　　 D. that

18.　 One is expected to behave _________ on some special occasions.

A. accurately　　　　 B. precisely　　　　　 C. appropriately　　 D. rightly

17.　 -What do you think of Tom?

-He has been working very hard. ______ he is an advanced worker.

A. No wonder　　　　 B. No doubt　　　　　 C. No worry　　　　　 D. No problem

16.　 After seven hours’ drive, they reached ______ they thought was the place they had been dreaming of. Ks*5u

A. that　 　　　　　　 B. what　 　　　　　　　 C. where　 　　　　　　 D. which