英语的.. 很急。 会的马上回答 各位谢了、

用动词的正确时态填空
Our desks and chairs ________________ (make) of wood. The paper of books and newspapers ______ also ___________ (make) from wood. Even some kinds of cloth __________________ (make) from it. Many people ____________ (burn) wood to keep themselves warm in winter. Indeed, wood _______ (be) important in our everyday life.
Where ________ wood __________ (come) from? It ________________ (take) from trees which _____________(grow) in the mountains. _________ you ____________ (know) how it ____________ (get) to us from the mountains?
First of all, trees ___________(cut) down when they ______________(grow) big enough. Then their branches _______________ (cut) off, and logs _______________(make).These heavy logs ________________(put) together in different ways and _________________ (take) down to the foot of the mountains. Some of them _________________ (float使漂流) down the small rivers and others _________________ (carry) down on trains.
Big trees ________________(cut) down in the mountains every year. Then young ones ______________________ (must, plant) so that we ______ always ________________ (can, have) enough wood. We have to take good care of mountains so that they __________ always _________________ (may, cover) with growing trees.

问老师不就解决了吗?