单项选择题

Jack _______from home for two days now, and I am beginning to worry about his safety.

A．has been missing
B．has been missed
C．had been missing
D．was missed
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单项选择题
To survive in the intense trade competition between countries, we must______ the qualities and varieties of products we make to the world-market demand.
A．improve
B．enhance
C．guarantee
D．gear
单项选择题
It was the ordinary ______ of the Waldorf Astoria Hotel, and the following words were written upon it in a faint delicate handwriting.
A．writing
B．handwriting
C．stationary
D．stationery
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