The rules we live by may seem arbitrary to a newcomer, but we have learnt the hard way that without absolute order, we cannot hope to survive here.

I want to go to school, but you _________ with me. A: need not to go B: need not go C: do not need go D: need go not

Water and air are _______ to human beings. We can not live without them. (B2-U1) A: harbou B: function C: definite D: essential

We are in some team, so we need to go in and get well along with the team members.

Our body grows most while we are asleep. The _____ children usually need more sleep. After we have plenty of rest, we can do our lessons better. Boys and girls about fifteen need nine hours of sleep. If we don't get enough _____ air, we will feel tired when we wake up. While in bed, we mustn't _____ our head. Our lungs need to get enough air, so we'd better open our window _______ and let fresh air in. Scientists say that cool air is better than _____ and sleeping in heated rooms does no good to our health.