1 . You may rely on _______that I shall help you. (用适当的词填空)

2 . lt is quite necessary _________ (read) it again. (所给词的适当形式填空)

3 . They want to make ________ clear to the volunteers that the cleaners are responsible ________ the cleaning work. (用适当的词填空)

4 . However, the railway quickly proved to be a great success and within six months, more than 25,000 people were using ________ every day. (用适当的词填空)

6 . Besides，almost every country has made ________ a must that students learn English in colleges. (用适当的词填空)

7 . ________ is estimated that coral reefs contribute billions of dollars to the world economy annually, providing food, protection of shorelines, and jobs. (用适当的词填空)

8 . Some people have expressed skepticism because it is unbelievable ________ she looks so perfect after a long day of work in the fields. (用适当的词填空)

9 . I think it no good________________ (read) in bed, which does great harm to your eyes. (所给词的适当形式填空)

10 . You owe ________________ to yourselves to stay longer. Overall, Montreal is a city with wonderful sights and sounds.（用适当的词填空）