5. 他的拐杖昨天丢了，没有了拐杖他就不能走路。

4. 众所周知，马克·吐温是一位伟大的美国作家。

3. 约翰说他一直在办公室工作，这是真的。

2. 书架上总共有11本书，其中5本书是我的。

1. 他经常迟到，这让他的老师很生气。

10. Such signs _____ we use in the experiment ______Greek letters.

　 A. as, are　　　 B. as, is 　　　C. that, are　　　 D. that, is

9. I bought some books from the bookstore, five ______were English novels.

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

8. The teacher gave us so difficult a problem ___ we couldn't solve.

　　 The teacher gave us so difficult a problem ___ we couldn't solve it.

　　 A. as　　　　 B. that　　　　 C. which　　　 　D. the ones

7. This is the same pen ______I lost yesterday.

　　A. as　　　　 B. that　　　 C. the one　　 　D. A&B

6. Pisa is a city, ____ has a leaning tower.

　 Pisa is a city, ____ there is a leaning tower.

A. which　　　 B. that　　　 C. where　　　　 D. there