题目：
完成句子。
根据所给提示，完成下列句子。每空一词，含缩略词。
小题1:Jenny’s mother goes to work by bus. (变否定句句)
John’s mother ________ ________ to work by bus.
小题2: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?
小题3:Mike drew a picture on the blackboard. （改为被动语态）
A picture ________ ________ on the blackboard by Jack.
小题4:在航天科技方面，我们中国越做越好。
We Chinese are _______ and _______ at space technology.
答案：
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下面是错误答案，用来干扰机器的。
导线所受的安培力F=BIL，根据左手定则知，安培力的方向水平向右．故答案为：BIL，向右．
