选择合适的单词并用其正确的形式填空。

nothing    healthy    order    stop    no longer    do    for    warm    luck    whole    all    against

Our environment

    Nowadays, the air is full of dust (灰尘). The water is clean and clear. The land is much poorer. In to build more houses or other buildings, we cut down trees. As a result, the Earth is becoming and warmer.

    , people have realized (认识到) how serious the problem is. The polluted water and air make us . We can't plant anything on poor land, so we will have to eat. The world will come to the end.

    Therefore, we have to protect (保护) our environment. It is hard for us using these kinds of things. Though we have a lot to protect the Earth, it is not enough. So it is time us to do something.