—Have you decided where to spend your summer holiday?—Not yet. We ___ go to Hong Kong.

Susan’s parents have bought a large house with a swimming-pool. It ____ be very expensive.

The Internet is really ________ to us. We can get a lot of things from it.

—Who’s that over there, Is it Jane?—No, It ________ be Jane. She is ill in hospital today.

—Everyone in my class passed the exam.—Oh, really? It ________ difficult.