Even if we learn something well， we will forget it_____we use it．（ ）
| A． |
while |
B． |
until |
C． |
unless |
Tom is always careless with his schoolwork．Could you help him？
No problem！I think he _______ to think twice before starting．（ ）
| A． |
should be told |
B． |
shouldn't be told |
C． |
should tell |
If the singer ______ to Zigong ______ September 20th， please call me．（ ）
| A． |
will get；on |
B． |
gets；on |
C． |
gets；in |
My uncle is against wasting anything．
No wonder he would rather _____ the old bike than ______ a new one．（ ）
| A． |
repair； to buy |
B． |
to repair： buy |
C． |
repair； buy |
I don' t want this book because of the price．May I have another one？
How about this one ？ It is as interesting as that one and ______ expensive．（ ）
| A． |
more |
B． |
less |
C． |
little |
______ do teenagers need to sleep ？
At least eight hours a night．（ ）
| A． |
How long |
B． |
How many |
C． |
How often |