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26、At the conference, political leaders from many countries promised to work   together to defend the world _____ terrorism and other threats.

A. for            B. against           C. beyond          D. without

25、Seldom ______ breakfast when I was a middle school student.

A. had I          B. I had             C. did I have      D. I did have

22、Some pre-school children go to a day care center, __________ they learn simple games and songs.

A. then          B. there              C. while         D. where

21、The manager suggested an earlier date ____________ the meeting.

A. on           B. for              C. about            D. with

20、---It’s a long time since I saw my sister. 

--- _______________ her this weekend?

A. Why not visit                   B. why not to visit

C. Why not visiting                D. Why don’t visit

19、---The last one __________________ pays the meal.   

---Agreed!

A. arrived       B. arrives         C. to arrive          D. arriving

18、I won’t call you, ________ something unexpected happens.

A. unless       B. whether         C. because         D. while

17、---How’s your tour around the North Lake? Is it beautiful?

---It ________ be, but it is now heavily polluted.

A. will         B. would        C. should       D. must