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—______do you write to your parents?-- Twice a month.
#43370
A
How often
B
How many
C
How long
D
How soon
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Sorry, I am late ______class.
#41163
A
in
B
with
C
for
D
at
I was feeling hungry, ______ I bought myself a sandwich.
#38600
A
but
B
so
C
or
D
because
There are ______ students in our school.
#37775
A
five hundreds
B
five hundred
C
hundred of
D
five hundreds of
Could you please ___ your room after school? 
#42166
A
to clean
B
cleaning
C
clean
D
cleans
Mr. Black used to be busy. But now he’s tired and      , so he has plenty of time to exer­cise.
#35799
A
hard
B
calm
C
free
D
nervous