18.　　　　　 I like cats while she _____pandas.(更喜欢,愿意)

17.　　　　　 I ______to say that the job has been filled.(遗憾)

16.　　　　　 Upon ______the homework, he went out to play.(完成)

15.　　　　　 It is d______to remember all the names and faces.

14.　　　　　 Their grades are well above a_____.

13.　　　　　 Missing the flight m_____waiting another 3 hours.

12.　　　　　 We are ______nuclear weapons to do away with nuclear weapons.(发展)

11.　　　　　 He _____to me for stepping on my foot.(道歉)

10.　　　　　 All the members are ______to attend the meeting.(require)

9. After graduation I c______to devote myself to doing this reaearch.