1 . He found his pen ________ (break) when he got back to the classroom from the playground.(所给词的适当形式填空)

2 . The species has nearly died ________ because human beings have done harm to them. (用适当的词填空)

3 . A survey(调查) showed that 56% of teens feel _________ (anxiety) or lonely, when they don’t have their cellphones. (所给词的适当形式填空)

4 . The first week was a little _________ (confuse) for him. (所给词的适当形式填空)

5 . I felt really_________ (nerve)紧张going into the exam. (所给词的适当形式填空)

6 . Starting a club at school can be_________ (challenge)for teenagers . (所给词的适当形式填空)

7 . They stared me (盯着我) with _________ (frighten) eyes. (所给词的适当形式填空)

8 . I can’t speak English_________ (fluent) (所给词的适当形式填空)

9 . He is _________(annoy ) to see people eating with their mouths open.(所给词的适当形式填空)

10 . In ______ (exrteme) cold weather, some plants can’t survive.(所给词的适当形式填空)