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What an accident! If the driver_________ carefully, things would not be as they are.

The price_________recently. I wonder whether it will remain so.

What I said and did at your house last night_________just between you and me.

30. The subway __________in our city, and I’m sure there will be fewer traffic jams in the future.

Some teenagers _______ their health because they often expose themselves to so many electric products.

The task _____ more difficult than we expect.

Scientists ______ SARS for several months before a major discovery was made in the field.

Before the coming YSL auction, the Christie’s Auction(拍賣) Company had advertised all of the articles ______ including the Chinese heads of Rabbit and Rat.

The new Hukou(戶口) policy, according to some experts, ______ to attract more high-end talents to contribute to Shanghai’s development.

He told us he _____ a concert _____ .