__________at the door before you enter the office，or you’ll be considered impolite
#65893
A
Knocking
B
Knocked
C
Knock
D
To knock
推荐题目
_______over everything whenever we want to make a decision, many people believe, and we will have less chance of making mistakes.
#65967
A
Think
B
Thinking
C
To think
D
Thought
---______ to give the letter to Mr. Wang. It’s very important. ---No, I won’t.
#59481
A
Remember
B
Don’t forget
C
Be sure
D
Make sure
---Jim, ______ miss the first bus.----OK, I_____.
#59373
A
don’t, will
B
doesn’t, will
C
don’t, won’t
D
doesn’t, won’t