— ______sleep do you think is necessary for a Grade 9 student? — 8 hours at least. 
#37367
A
How often
B
How long
C
How many
D
How much
推荐题目
______ trees are cut down in the forests every year.
#36306
A
Thousand
B
Thousands
C
Thousands of
D
Thousand of
When he saw a ticket on the ground, he stopped ____.
#43572
A
to pick it up
B
pick it up
C
to pick up it
D
pick up it
_______ which way to take, the little boy behaved like a real gentleman who comforted his sister from time to time.
#39514
A
Leaving to wonder
B
Having left to wonder
C
Left wondering
D
Left to wonder