-Someone’s knocking at the door. Is it your mother?-No, dad. It _____be mom. I saw mom ____in the bedroom just now.
They are going to have a picnic _______ next week.
There are about ________ students in our school.
—Do you like our English teacher? —Yes. I think his class is very ________.
This is your pencil. ________ is over there, on the desk.
Doing morning exercises is good ________ our health.