—You should ______ the shower when you are washing your hair.—OK. I will. We need to save water.
Who’s that boy reading in the garden? Is it David? ----It______be David. I saw him in the classroom just now.
She _____________ Beijing when she _________.
--- Don’t forget _____________ the door when you leave the classroom.
_______________ do we need ?
—Where _________ we go this weekend ? — Let’s go to the park together.