____you stepped into the lab with your shoes on? You are supposed to take them off before you enter it.
#3086
A
How come
B
How about
C
How dare
D
How long
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—Could you tell us _________ to do it?—Of course. First of all, you should clean the wall, then clean the floor.
#21589
A
when
B
what
C
how
D
whether
--- Excuse me. --- ______? --- Could you tell me how I can get to the First Department?
#3839
A
Pardon
B
Why
C
Yes
D
Please
—I’m going to Sanya for my holiday tomorrow.—_______
#21926
A
Have a good time!
B
You’re right.
C
It’s good.
D
Goodbye