The boy followed the teacher and entered the classroom.
Young children can ______fireworks if their parents are not with them.
— ______ in the yellow river?— There’s a nice boat.
—_____does your mother go for a walk?— Every afternoon.
—Is Sandy in Mr. Wu's office ?— Yes, she __________Mr. Wu __________her birthday party.
— How is your friend?— He is _______, and he is at school.