选出最适当的单词填入空格内.

1 Delicate machines should be handled with great (      ) .
a.force
b.care

2 The farmers drained the swamp to get more (      ) for crops.
a.land
b.water

3 With brooms we (      ) our rooms.
a.clean
b.decorate

4 (      ) voices hailed us as we entered the hall.
a.Angry
b.Cheerful

5 The foul air in this room should be (      ) .
a.changed
b.cooled down

答案：b a a b a