1 . I never forget this summer vacation, ___________I spent the happy days with my friends.

2 . We shouldn’t spent our money testing so many people, most of _____are healthy.

3 . He was generous with his time , ____ ______ I was grateful .

4 . Your speech was heard by a group of five judges , all of ______ agreed that it was the best one this year .

5 . However , the next king of Prussia , Frederick William I , ___ ____ the amber room belonged , decided not to keep it .

6 . He often lent me a hand when I was in trouble, _____ which I was grateful. (用适当的词填空)

7 . I can’t thank Professor Smith enough, ______ whose help I would never have got this far.（用适当的词填空）

8 . Under Mr Smith's guidance, my English has improved a lot, for ________ I am grateful. （用适当的词填空）

9 . Last week, only two people came to look at the house, neither of ____________wanted to buy it.(用适当的词填空)

10 . Such novelists as Tolstoy are widely read, of _________ works, however, some are difficult to understand. （用适当的单词填空）