My sister is often sick because she doesn’t do physical exercise.
A. If my sister does physical exercise, she won’t often be sick
B. If my sister isn’t physical exercise, she does sick.
C. If my sister did physical exercise, she wouldn’t often be sick.
D. If my sister wasn’t physical exercise, she would do sick.

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A. has failed
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If you ____ French for 2 years, you ____ enough to have a simple conversion with someone French.
A. have studied / should know
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Scientists can see planets and stars close up through this.
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