根據(jù)所給單詞的適當(dāng)形式填空

While you cross the street, you should look both ________ (side).
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科目：初中英語 來源：期末題 題型：填空題

完形填空。閱讀下面的短文，根據(jù)上下文意義和所給單詞首字母，寫出標(biāo)有題號每小題空白處適當(dāng)單詞完全、正確形式。
      If you travel by a  1   across the center of Africa or South America, you fly over forests for thousands
of kilometers. These great forests are the oceans of t  2  . There are thousands and thousands of kinds of
plants and a  3  .
      However, the world's forests are getting s  4   all the time. In many places, we're cutting down the trees
because we need wood and we need more farmland. Some people say that t  5   will not be any forest like
these in 30 years. What will happen if they d  6  ?
      If we cut down our forests, a lot of plants and animals will disappear from the w  7  . In a lot of places
the new farmland will soon look like the old desert. Crops will not grow there. It will not rain very often, and the
weather will get very hot. Perhaps the climate (氣候) of the world will c  8  . This will be d  9   for
everyone in the world. That's w  10   we must take care of our forests.
1.                  2.                 3.                  4.                 5.                 
6.                  7.                 8.                  9.                10.              

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