题目内容
根据所给提示，完成下列句子。每空一词，含缩略词。
69. Jenny’s mother goes to work by bus. (变否定句句)
John’s mother ________ ________ to work by bus.
70. It took him three hours to write the letter yesterday evening. (对划线部分提问)
_________ ________ did it take him to write the letter yesterday evening?
71. Mike drew a picture on the blackboard. （改为被动语态）
A picture ________ ________ on the blackboard by Jack.
72. 在航天科技方面，我们中国越做越好。
We Chinese are _______ and _______ at space technology.
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