单项选择题

The agency,______ to set and enforce health standard for American workers, has been promising a cotton dust standard for several years.

A．which is
B．which it is
C．whose job it is
D．whose job is
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单项选择题
A convenient way is to set the food on a piece of aluminum oil, ______to the air for half an hour, and then cover it with a dish.
A．let it stay open
B．let it stay opened
C．letting it stay open
D．letting it stay opened
单项选择题
In learning a foreign language, ______English, one should first pay attention to speaking, which is the groundwork of reading and writing.
A．says
B．say
C．to say
D．saying
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