The police at Denver International Airport examined a bomb threat against a United Airlines flight to San Francisco,____________ the flight for hours.
| A．delayed | B．to delay | C．delaying | D．had delayed |
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It’s usually warm in my hometown in March, but it _____ be rather cold sometimes.
| A．must | B．can | C．should | D．would |
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I have ________ all my papers but I still can’t find my notes.
| A．looked through | B．looked for | C．looked after | D．looked out |
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— Now that you like computers very much, isn’t that a good idea to get a ______?
— Well, I’d like to, but I can’t afford such an expensive computer at present.
| A．one | B．them | C．it | D．that |
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I have many friends, _______ some are businessmen.
| A．of them | B．from which | C．of who | D．of whom |
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The car has been well maintained and is ________ excellent condition.
| A．in | B．under | C．on | D．with |