B: Yes, I stayed {#blank#}2{#/blank#} him when I was there.

    Our body rests while we sleep. Our body grows most while we are asleep. Children who are tired usually need more sleep. We can get at our lessons better, after we have had plenty of rest. Boys and girls who are eight or nine years old need ten hours of sleep every night. If we do not get enough fresh air, we will feel tired when we wake up. While in bed we must not cover our heads. Our lungs (肺) need to get enough fresh air. If we open our windows at night, we can have plenty of fresh air. Cool air is better than warm air.