将斜体印出的部分改写成被动语态，完成练习后再对照课文核对你的答案。
Change the form of the phrases in italics. Do not refer to the passage until you finish the exercise.
用正确的时态填空，完成练习后再对照课文核对你的答案。
Give the correct form of the verbs in parentheses. Do not refer to the passage until you finish the exercise.
用正确的时态填空，完成练习后再对照课文核对你的答案。
Give the correct form of the verbs in parentheses. Do not refer to the passage until you have finished the exercise.
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