50.(　　 )----Can you stay here longer?

　　　　 ----　　 　,but my father is waiting for me at home .

　　　　 A. No problem　　 B. I’m afraid not　　 C. I’d love to　　 D. No

49.(　　 )---How time flies! I’ll never forget the days 　　we studied together .

　　　　 ---Same here . I’ll remember the days 　　　we spent in the past three years forever .

　　　　 A. that ; when　 B./ ; that　 C. when ; /　　 D. when ; when

48.(　　 )----You’d better 　　work too hard like this.

　　　　 ----I see .You mean 　　　too hard makes one tired and ill .

　　　　 A. not ;work　　 B. don’t ; working　 C. don’t ; to work　 D. not ; to work

47.(　　 )---You’ve got a new dress, too .

　　　　 ---Yes. Mine is 　　　, but not so 　　　as yours.

A.　　　 better ; cheap 　　　　　　　　　　B. more better ; expensive 　　　　　　　　　　

B.　　　 C. better ; more expensive 　　　　　D. good ; cheaper

45.(　　 )---Do you like 　　a doctor for the children?

　　　　 ---Yes.　　 A children’s doctor is rewarding(有益的).

　　　　 A .to be ; Be　　 B. being ; To be　　 C. be ; Be　　 D. become ; Being

(　　 )46---Why does the teacher ask Jim to go to his office?

　　　 ---Because Jim was so busy 　　　the answer from Lily’s paper that he forgot 　　her name into his.

　　　 A. to copy ; to change　　 B. to copy ; changing

　　　 C. copying ; to change　　　 D. copying ; changing