单项选择题

With the development in science and technology man can make various flowers ______ before their time.

A．be bloomed
B．bloom
C．bloomed
D．blooming
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单项选择题
Jimmy earns his living by _______works of art in the museum.
A．recovering
B．restoring
C．renewing
D．reviving
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
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