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
