10. Danny failed the test because he did it  ( care-

less ) .

9. Look!They are   (dig) a hole beside the tree.

8. How often do you brush your   (tooth) ?

7. There's  (dusty) in the house everywhere.

6. Eating junk food is   (harm) to children's health.

5. Open your presents carefully and recycle or   (再

用) the wrapping paper the next year.

4. Today,oil and natural gas have taken the place of (煤) and wood in most areas.

3. Remember to turn off the   (煤气) when you leave

home.

2. The big box is  (空的) ，so it is light.

1. Please tell me the results of that  (调查) .