Why are you standing, Alice?—I can’t see the blackboard clearly. Two tall boys are sitting _______ me.[ ]

Hurry up, Mum. The lights are turned on. Dad has been back.—It _________ be him. He has gone to Shanghai.

John arrived _____ London _____ a cold morning.[ ]

He had hardly reached home _______ an unexpected guest came to visit him.

Lisa has made great progress these days.— , and . [ ]