This is a photo of______.

Can I go to the movie, Mum?— Certainly. But you _______ be back by ten o’clock.

He lives_____ with his grandparents. [ ]

Mike’s parents have bought a 2-floor house with a swimming pool.— Oh, it________ be very expensive.

Some people are worrying about the possibility ________ mobile phones could be responsible for a range of illnesses, from rashes(皮疹) to brain tumors．