Trắc nghiệm: It is important that he ________ a gallon of water with him if he wants to hike to the bottom of the Grand Canyon,It is important that he ________ a gallon of water with him if he wants to hike to the bottom of the Grand Canyon.

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It is important that he ________ a gallon of water with him if he wants to hike to the bottom of the Grand Canyon, It is important that he ________ a gallon of water with him if he wants to hike to the bottom of the Grand Canyon.

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