suggested the number of cars should be limitedto stop air pollution —_______, the idea is not very practical

The train ________ arrive at 11∶30, but was an hour late

Could I have a word with you，mum?—Oh，dear，if you _____．

Shortly after the accident, _____ policemen were sentto the spot to keep order.

Tom is one of _________ students in my class . — Yes . He usually prefers _________ at home toplaying outside .