______ at the door before entering please. 
#66016
A
Knocked
B
Knock
C
Knocking
D
To knock
推荐题目
   hardworking students they are!
#66236
A
What
B
What a
C
What an
D
How
 ________ the instructions very carefully when filling in the form.
#65933
A
Following
B
To follow
C
Follow
D
Followed
The floor is so dirty .Would you please     ?
#59450
A
to mop up it
B
mop up it
C
to mop it up
D
mop it up
Boys and girls, _____in bed. It’s bad for your eyes
#59417
A
not read
B
doesn’t read
C
no read
D
don’t read