—May I         this pair of blue jeans? —Yes, you        .

—Listen! Is that Millie singing?—No. It _____ be Millie. She has gone to Beijing.

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

The room is in a terrible mess; it        have been cleaned.

It’s said that there are plenty of hotels here .There       be any difficulty for you to find somewhere to stay.