单项选择题

(The atmosphere) (is consisted) of certain gases (mixed together) (in) definite proportions.（）

A. The atmosphere
B. is consisted
C. mixed together
D. in

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单项选择题
The only thing (what) really matters (to) the children (is) (how soon) they can return to their uncle's farm.（）

A. what
B. to
C. is
D. how soon
单项选择题
She is always （） of others.

A. considered
B. considerate
C. considering
D. considerable
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