Excuse me. Where is the museum?—–It is quite far. It will take you half ___ hour to go there by _____bus.

Can you please tell me something about life in the future?—Oh, maybe in the future, people will _______ by robots.

There is _____ river at the foot of the mountain(山). _____ river is dangerous.

Is that Kate’s car?–It ______be hers. She has just gone for a meeting.

Scientists are trying to ways to treat the terrible disease called H7N9.