TOEFL

A spacecraft is freed from friction _______ launched into space. A. it B. it is C. after is D. after it is

_______ with their surrounding, or they hide in crevice for protection. A. Lobsters B. Lobsters blend C. Lobsters blending D. Because lobsters blend

____ a ball-and-socket joint, the elbow is a simple hinge joint. A. while the shoulder B. while the shoulder is C. the shoulder is D. the shoulder

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