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.