初一英语用所给的适当形式填空!求答案和理由

初一英语用所给的适当形式填空!求答案和理由
II.用所给词适当形式完成句子
1.Trees are important in our _____________(day) lives.
2.There are ___________(many) people in this hall than that one.
3.We all know that smoking is ____________(harm) to our health.
4.Air is a mixture(混合物) of ____________(gas).
5.Mr Green lives in a ______________(convenience) life.
6.Tim has been a fire ____________(fight) for five years.
7.Look!_____________(child) are having fun there.
8.We should ______________(discussion) the problem now.
9.I can’t ______________(imagination) a world without love.
10.____________(leaf) turn yellow and fall down in autumn.
11.We have to stop ____________(pollute) the earth.
12.Trees are ______________(use) for our human.