Cable TV began in 1948 in the USA, but it took 50 years________ 66 percent of American households had it.
A. before B. after C unless D. since
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Fred, who had expected how it would go with his daughter, had a great worry ______ his mind.
| A．in | B．on | C．with | D．at |
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| A．since | B．when | C．as | D．while |
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| A．held up | B．turned down | C．broke up | D．pulled down |
Jerry had worked hard for his chemistry examination so that he could be sure of passing it at his first_____ .
| A．assumption | B．appetite | C．attempt | D．accumulation |
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