用方框內(nèi)單詞的適當形式填空。

weigh, storm, journey, gravity, limit

1. We have to          the use of paper,because making paper waste much wood.

2. They have visited many places of interest,so they have a wonderful        .

3. Because the forests were cut down,there are some          in the north of China.

4. The          on the surface of the moon is one sixth of the earth.

5. —How heavy is the box?

—It        about 56 kilos.

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