28. The Smiths went on business, _____ their eldest child __________ the house.

　 A. leaving, in charge of　　　　　　　　　　　　　　　　　　　 B. left, in the charge of　

　 C. leaving, in the charge of　　　　　　 D. left, in charge of

27. _________ you have got a chance, you should make full use of it.

　 A. After　　　　　　 B. Now that　　　　　 C. Although　　　　　 D. As soon as

26. _____ is hard to imagine what life would be like without water and electricity.

　　 A. As　　　　　　　　　　 B. What　　　　　　　　　 C. It 　　　　　　　　　　 D. That

25. --- Don’t you believe me? I am not joking this time.

--- _________, I won’t believe _______ you say.

　　 A. No, whatever　　　 B. No, no matter　　　 C. Yes, whatever　　　 D. Yes, no matter what

24. --- Is this a really difficult problem to deal with?

--- Yes, it is a special situation we do not ________ very often.

A. come about　　　　　　　 B. come across　　　　 C. come up　　　　　　　 D. come out

23. --- The movie has been on for 10 minutes. We missed the beginning of it.

　　 --- Yes. We ____________a little earlier.

　　 A. should have come　 B. should come　　　　 C. come　　　　　　　　　 D. came

22. --- Linda, are you going to Barbara’s wedding party tomorrow?

　　 --- Of course, I _______ if _________.

　　 A. am, shall be invited　　　　　　　　　　　　　　 B. shall, being invited C. will, I’ll be invited　 D. am, I am invited

从A、B、C、D四个选项中，选出可以填人空白处的最佳选项，并在答题卡上将该项涂黑。

21. All the preparations for the task ___________, and we are ready to start.

　　 A. completed　　　　　　 B. have been completed　　　　　　　　　　　　　 C. has been completed　 D. complete

15.的计算可采用如图5所示的算法，则图中①处应填的条件是　　　　　 .

14．设有一个边长为2的正方形，将正方形各边中点相连接得到第二个正方形，再将第二个正方形各边中点连接得到第三个正方形，…，依此类推，这样一共得到了10个正方形.则这10个正方形面积和　　　　　 .