1 . Over 120, 000 people in Norway, of _________ 40% are college students, use the app. （用适当的词填空）

2 . He has three sons, one of ________ is an engineer. (用适当的词填空)

3 . There are 60 students in our class, out of ________ only 20 are taking an optional course. (用适当的词填空)

4 . The old man saw some Germans taking apart the Amber Room. My brother is talking to the old man. (用非限制性定语从句合并句子)

5 . He wrote a lot of novels, many of _________ were translated into foreign languages. (用适当的词填空)

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

7 . I wish to thank Professor Smith, without_______help I would never have got this far. (用适当的词填空)