Điền vào chỗ trống

điền in, on,at
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
school