题目内容：

C. Read the passage and nil in the blanks with proper words（在短文的空格内填入适当的词,使其内容通顺，每空格限填一词，首字母已给）：

Everyone needs sleep. In fact, all living things need sleep. Having a sound and good rest make us 1.. It is believed that our brain develops best during sleep, it helps all our systems work well while we are awake. Sleep a2. our brain to recognize all events during the day and will improve our memory development.

For a student, eight to ten hours of sleep is required to give him or her energy for the f3. day. A good sleep allows them to grow p4. and mentally（心理上）.

With e5. sleep at night, students would be able to wake up early and be ready for school activities. They will be able to listen carefully in class and would have the a6. memorize the things that they learn and remember them in the future.

Eight hours of sleep makes students active through the whole day at school. They would be able to p7. well in class, take down notes and finish their homework. When they have slept well, they can easily understand their lessons. Good sleep prepares them well for the challenges （挑战）at school, from paperwork to sports. They will be ready to solve difficult tasks that require mental ability and skills.