Cars, buses and bikes ________ stop when the traffic lights turn red.

The school rules state that no child ___ be allowed out of the school during the day , unless accompanied by an adult .

—Why does Mary look so worried today?
—I’m not sure, but she _____ a small accident driving here.

—Could you help me write the annoying composition?
—No! As a student, you _____ do it by yourself.

It’s really a great pity that all of you ____ leave so soon. It’s been pretty nice having you all at my birthday party.

You _______ call him if you want to, but you _______, for he’ll surely come here soon.

--- What’s the weather like?
--- Pretty hot and wet in the summer, but it _____ be quite cold in the winter.

— Can I pay the bill by check? 
— Sorry, sir. But it's the management rules of our hotel that payment ______be made in cash.

I went there in 1984, and that was the merely occasion when I ________ the journey in exactly two days.

The weather in Inner Mongolia is always dry, but sometimes it _____ rain heavily.