用动词的正确时态填空 Our desks and chairs ________________ (make) of w

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.
50分有人要不？要正确！

1 are made
2is made
3 are made
4burn
5 is
6 is came
7 is taken
8growing
9do know gets
10 were cut growed
11were cut were made
12were put taken
13 floated were carried
14are cut
15 must be planted can having
16may\might covered
不保证全对 可以不给分