—________ have you been in this school?—For two years. 
#62123
A
How often
B
When
C
How soon
D
How long
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______ is necessary _______ us ________learn English well.
#62097
A
It, of, to
B
This, of, of
C
It, for, to
D
This, for, to
——_________ should your robot need_________ batteries?——Every two months.
#62268
A
How soon, to be changed
B
How long, to change
C
How much, change
D
How often, to change
—What’s the woman with a ponytail like? —She doesn’t talk much, _____________________.
#61970
A
she is a nurse
B
she is shy and quiet
C
she likes music
D
she is ten years old
We can’t fix this machine well. Can you show us ___? 
#62014
A
how to do
B
what to do it
C
how to do it
D
where to do