All the students in my class can’t ______ the math problem. It’s too difficult for us.A. work on B. work out C. work for
It’s very cold outside. Most of the families keep their windows _________. openB. opened C. closeD. closed
Jenny went into the room, took off her coat and ______ down on a sofa.
—Where __________ you find your ticket? —I __________it on the ground.
—Is ______ here? ---No, Tom isn’t here. But it’s time to have class.
He turned around, but he couldn't see_______.