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__________at the door before you enter the office，or you’ll be considered impolite
#65893
A
Knocking
B
Knocked
C
Knock
D
To knock
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________ if you want to do something, or you won’t be able to do it well.
#66250
A
To try your best
B
Trying you best
C
Try your best
D
Unless you try your best
______ wake up your sister, Ben. She needs a good sleep.
#59354
A
Don’t
B
Doesn’t
C
Aren’t
D
Can’t
Be sure_____ miss the concert .-- OK, I won’t.
#59486
A
don’t
B
to not
C
to
D
not to
 _______ your mind and you will find the way.
#66254
A
Using
B
Use
C
If you use
D
To use
_____worried about me，Mom.I’ve grown up.
#59483
A
Don’t
B
Don’t be
C
Not
D
Not be