Fill in each blank with the proper form of the given word.
用括号中所给单词的适当形式填空。
Choose the best word and use its proper form to fill in the blank.
择方框中所给的词并用其适当形式填空。
Increase your fall distance in small increments. Maintain proper form as you practice falling.
每次增加一点下坠距离，在下坠过程中保持正确的姿势。
Increase your fall distance in small increments. Maintain proper form as you practice falling.
每次增加一点下坠距离，在下坠过程中保持正确的姿势。
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