15. We saw her ... football in the schoolyard.
Mercury is half the size of the earth. Because it is much lighter, it has much less gravity. If you
A. to play B. play C. is playing D. playing
can visit Mercury in a spaceship, you will find it a strange world. Its low gravity makes you feel
very light. If your weight on earth is 100 pounds, your weight on Mercury is only 27 pounds.
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