1 . The book, _________ which he paid 6 yuan, is worth reading. (用适当的词填空)

2 . In the park there are many flowers, the color _________ which is bright and nice. （用适当的词填空）

3 . The speed________ which you drive your car mustn’t be too high. （用适当的词填空）

4 . Alec asked the policeman with___________ he worked to contact him whenever there was an accident. (用适当的词填空)

5 . Sailing across the ocean alone was an achievement___________ took courage. （用适当的词填空）

6 . Samuel survived when the car___________ he was a passenger in turned off the road and hit a tree. (用适当的词填空)

7 . The thought of going back home was all___________ kept him happy while he was working abroad. （用适当的词填空）

8 . You can find whatever you need at the shopping Centre, ___________is always busy at the weekend. （用适当的词填空）

9 . The United States is made up of fifty states, one of___________ is separated from the others by the Pacific Ocean. （用适当的词填空）

10 . This is the same bag ___________ I have lost yesterday. （用适当的词填空）