Điền in; on; at

2345678ST
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dien in, on
are you going? - To the library.
do you usually bring to school? - Textbooks, notebooks and pens.
do you go to school? - By bike.
is Mary talking to? - Mrs. Berry, her English teacher.
is your favorite subject? - Maths.
is your first day at school? - Oh, it's great.
does Phong do judo? - Three times a week.
students are there in your class? - Forty
, at