根据所给提示，完成句子。每空一词，含缩略词。
(1). I was doing my homework at seven last night.(变成否定句)
I ________ ________ my homework at seven last night.
(2). They have P.E. four times a week now. (对划线部分提问)
________ ________ do they have P.E. now?
(3). Please tell me where we can put our mobile phones. (改为同义句)
Please tell me ________ ________ put our mobile phones.
(4). 学生不应该熬夜，因为他们需要充足的睡眠。 (完成译句)
Students should not ________ ________ because they need enough sleep.
(5). 这些书太有趣了，孩子无法停止阅读。 (完成译句)
These books are ________ interesting ________ the children can’t stop reading them.
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