1 . Spending too much time online is unhealthy and makes ________ very difficult to focus on other things in life and some students even become addicted to the Internet and cannot concentrate on school and family life. (用适当的词填空)

2 . You can rely on ________ that I will help you when you are in trouble. (用适当的词填空)

3 . ________ has been found that plastics can be widely used in industries.(用适当的词填空)

4 . Though he is addicted________maths, he finds ________hard to learn it well. (用适当的词填空)

5 . When in college, I found ______ difficult to get along with my roommates. (用适当的词填空)

6 . ________ is not surprising that he decided to stay for another year in the village school. (用适当的词填空)

7 . After-class activities make it possible for us ________ (enrich) our knowledge and build up our body. (所给词的适当形式填空)

8 . You can rely on _________ that my introduction and efforts can deepen visitors’ understanding of traditional Chinese culture.(用适当的词填空)

9 . The Internet has made ________ possible for friends and family to keep in touch easily. (所给词的适当形式填空)

10 . Celebrating Naadam with my friend was totally worth ________. (用适当的词填空)