Experts (专家) say students usually need eight to ten hours' sleep at night, but most Chinese students do not get enough sleep. Some Chinese parents are usually glad to see their children studying late. They think their children work very hard. But not all parents are happy about this. Once a mother told us her son asked for one more minute to sleep every morning. Like thousands of students in China, he has to get up before six every morning.

　　A report shows that without a good night's sleep, students will be weaker than they should be. Many students sometimes fall asleep in class. They often stay up late because of too much homework, but it's not the only reason. Sometimes they watch TV or play the computer games late into the night.

　　Experts say students should have good study habits. So some clever students never study late, they can work well in class.

(1) The son of the mother asked for more sleep because ________.

[　　]

A．he didn't have enough sleep

B．he didn't want to go to school

C．he didn't need to go to school

(2) When students don't get enough sleep, they may ________.

[　　]

A．become too weak to sleep

B．sleep in class

C．go to bed early at night

(3) “stay up late” here means ________.

[　　]

A．stand up for a long time

B．not to go to bed until very late

C．stay out late

(4) Students often stay up late because ________.

[　　]

A．they have a lot of homework to do

B．they watch TV

C．they play computer games

(5) Which of the following is right?

[　　]

A．Sleeping less means working hard.

B．Some clever students work well in class because they never study late.

C．All parents are glad to see their children studying late.