用适当的介词或副词填空

I practise the roll play in working with a group
Tim is doing a survey on learning English
When I was studying in middle school, I often made mistakes in grammar.
Math wasn't very easy to us
To begining, he could say nothing and his face turned red, becasue he was afraid that his classmates might laugh at him.
we should just listen to the most important messages, not everything.
What istn't easy to learning English
Making in coversation.

by in
of
in
for
with at
to
for in