26. ---Will Tony come to the party tonight?

　 ---I’m not sure. He _______stay at home preparing for the coming exam.

A. must　　　 B. might　　　 C. can　　　 D. need

25.The house I grew up _______ has been pulled down and replaced by a hospital.

　 A. in it　　　 B. in　　　 C. in that　　　 D. in which

24. ______ the project in time, the staff have been working at weekends since last summer.

　 A. Completing　　 B. Having completed　 C. To have completed　 D. To complete

23. ---Why do you keep looking back?

　 ---I have a feeling that we _______.

　 A. were followed　 B. have been followed　 C. are being followed　 D. are following

22. Tom is determined to go on _______ voyage across the Atlantic Ocean again although he is still in ______ bad condition.

　　 A. the; the　　 B. a; the　　　 C. the; a　　　 D. a; /

第一节 单项填空(共15小题； 每小题1分，满分15分)

21. ---The meeting’s been put off until next week.

　 ---Sorry, ______. Could you say it again?

　　 A. I didn’t mean that　　 B. I didn’t know　 C. I didn’t take it　 D. I didn’t get it

22．(14分)已知数列的前和为，且满足。

(1)问：数列是否为等差数列？并证明你的结论；

(2)求；

(3)求证：。

21．(12分)已知椭圆的中心是坐标原点，它的短轴长为，一个焦点为，一个定点为，且，过点的直线与椭圆相交于两点。(1)求椭圆的方程和离心率；(2)若以为直径的圆恰好过坐标原点，求直线的方程。