3. We bum wood to get heat.

2. We can get heat from many things.

1. Heat is important to us.

5. Please get up before six tomorrow.

　 Please don't get up________________ six tomorrow.

4. You must throw the paper into the litter bin.

You mustn't throw the paper_________ _____________ the litter bin.

3. Don't put the small box under the big one.

Don't put the big box________________ the small one.

2. The supermarket is behind the high-rise.

　 The high-rise is__________ __________ ______________ the supermarket.

1. The cinema is near the supermarket.

The cinema is____________ ______________ the supermarket.

6. Whales can stay______________ the water_____________ a long time. They come up only_____________ air and their noses are____________ the top of their heads.