__________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
—I'd like to have some lunch but I have to stay here doing my work.—___________ what you want and I can get it for you.
#66307
A
To tell me
B
Telling me
C
If you tell me
D
Tell me
_____ a piece of cheese cake my mum prepared---You won’t be disappointed!
#66018
A
Trying
B
Tried
C
To try
D
Try
---What shall we do with our project, stop or continue, sir? ---________ and try to finish it _______.
#66175
A
Go on to do it; ahead of time
B
Go on doing it; before time
C
Go ahead with it; ahead of time
D
Continue to do it; before the time.
—I’m leaving now. —________ you turn off the lights and the computer.
#59400
A
To make sure
B
Make sure
C
Made sure
D
Making sure