1 Think and write.(想一想,根据提示写单词)
(1) He is so (着迷的) about computer games that he stays up late every night.
(2) Spending too much time online is a (浪费) of time.
(3) We should (限制) our time on the Internet.
(4) The (影响) of Internet addiction on teenagers' health is serious.
(5) Many students have trouble (控制) their online time.

(1) crazy (2) waste (3) limit (4) influence (5) controlling

2 Complete the sentences with the given words in their proper forms.(用括号中所给单词的适当形式完成下列句子）
（1）Internet (addict) is becoming a big problem among teenagers.
（2）If you spend too much time (play) online games, you will feel tired.
（3）The doctor advised him (reduce) his online activities.
（4）They are trying to find out the (solve) to the problem of Internet addiction.
（5）She is always (worry) about her son's Internet use.

(1) addiction (2) playing (3) to reduce (4) solution (5) worried

() (1) Internet addiction many problems to teenagers' study and life.

A.cause
B.causes
C.causing
D.to cause

(1) B

()(2) Teenagers spend too much time on the Internet. It's bad for their eyes.

A.should
B.shouldn't
C.need
D.needn't

(2) B

() (3) If you online for too long, you will feel tired.

A.stay
B.stays
C.staying
D.to stay

(3) A

() (4) The research shows that Internet addiction can lead to depression.

A.a
B.an
C.the
D./

(4) D

() (5) He has difficulty his online time because he really loves playing computer games.

A.manage
B.manages
C.managing
D.to manage

(5) C