Mountaineers _______ climb Mount Everest must make reservations to do ...

★ TOEFL

Mountaineers _______ climb Mount Everest must make reservations to do so, often up to seven years in advance.

A. want to

B. they want to

C. who want

D. wanting to

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The planet Mercury __________rotations during every two trips around the sun.

A. three complete

B. completes three

C. the completion of three

D. completing three of the