We don’t sweep the floor for a few_________ .     
#27943
A
day
B
week
C
days
D
month
推荐题目
TV set is one of       in the world.
#28285
A
most useful invention
B
the most helpful inventions
C
more helpful inventions
D
less useful invention
Acid rain comes from _____. 
#29890
A
the river
B
the water
C
the clouds
D
the forests
There’re many _______ on the big tree.
#29851
A
leaf
B
leaves
C
leafs
D
leafing