下面句子中有一处错误，请找出来并加以改正。
How many chair are there in the classroom?________
Mom，this's my friend，Tom．________
He and I am good friends．________
－Is there________water in that cup?
－No，there isn't．
A．
any
B．
some
C．
many
D．
much
There are some________，________and________in the shop(商店)．
piano，beef，potato
pianos，beef，potatoes
pianoes，beefs，potatoes
pianoes，beef，potatoes
－________books are there in your bag?
－Ten．
How
How old
How many
How much
－Are there lots of trees in the park?
－________．
Yes，there is
No，there are
Yes，there are
No，there isn't
－How many________are there in your school?
－About 40．
class
class'
classes
class's
用be动词的适当形式填空。
－Are there any students in the classroom?
－No,there ________．
－Are you a boy?
－Yes,I________．