No sooner ______ down on bed ______ the telephone rang.
Air quality in Beijing was rated as poor______ more than 5 million cars in the capital.
It was______ she went back home______ Kate realised she had left her schoolbag at school.
—What are you busy with?—The sports meeting ______ in our school next week.
China is embarrassed by such a fact: Chinese visitors______ rubbish on the Great Wall, followed by a foreigner picking up the litter.
As a well-known Chinese saying goes, “If you want to be rich, you______ first build roads.”