Every pupil is ______to be in the classroom at 7.am.

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The day — my birthday — I had been looking forward to _______ at last.

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My brother left home five years ago. I _______ nothing from him up to now.

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We won’t know how much food to buy until we decide how many people ________.

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In the rainforest of the Amazon, 50 to 150 plant species _____ every day.

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To help today’s customers make a choice, a company in New York _____a video trolley — a supermarket trolley with a video screen to display advertisement and price information.  

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If a computer crashes, you will lose the file you _________unless you save it regularly.

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When Bill Gates decided to stop schooling and created Microsoft in 1975, he ______ law at Harvard University.

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Because of the sharp drop of birth rate, the number of students sitting the college entrance exams ______ all the time

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My parents ____ in Hengshui. They were born there and have never lived anywhere else.