同义句改写：1.I often help my mother do the housework.I often help my mother__the housework.2.Tree
同义句改写：1.I often help my mother do the housework.I often help my mother__the housework.
2.Trees fight against air pollution.trees__ __against air pollution.
3.we don't want a world without trees.we_a world_trees.
4.the police provided me with some help.the police provided some help__ __.
5.the plane is late because the weather is bad.the plane is late__ __the weather.
适当形式填空
1.smoking can be_to your health.(harm)
2.trees are the biggest and oldest_ things on the Earth.(live)
3.the furniture in my house is_of wood.(make)
4.I think volleyball is_popular than basketball in our school.(much)
5.we should do some exercise to keep us_.(health)