______ at the door before entering please. 
#66016
A
Knocked
B
Knock
C
Knocking
D
To knock
推荐题目
_________ play in the street.It’s very dangerous.
#59409
A
Do
B
Not
C
Don’t
D
Doesn’t
You can’t imagine _____ when they received these nice Christmas presents.
#66002
A
how they were excited
B
how excited they were
C
how excited were they
D
they were how excited
Those who want to say anything more       your hand and then        to speak.
#66049
A
arise; raise
B
raise; rise
C
raise; arouse
D
rise; raise
——________ late for school again, Tom!——Sorry, I promise I _________.
#59444
A
Don’t, will
B
Don’t be, won’t
C
Don’t be, don’t
D
Don’t, won’t