The students stopped talking_________the teacher came into the classroom.
That hard-working woman began to do housework as soon as she __________home.
__________players will take part in the Youth Olympic Game this year.
Mrs. Bond is a good teacher, he is also an old friend of __________.
Look! A large group of birds are flying __________the mountain!
It’s important for us to keep food __________in the fridge, especially in summer.