你给我打电话时,我正站在图书馆的前面。I________ ________in front of the library when you________ ________.
When we left, the kids said goodbye to us (礼貌).
The stamp I bought yesterday (花费)me 20 yuan.
It's a good habit to brush your (牙齿) after a meal.
People often fly kites on sunny and (多风)days.
污染如此严重,人人都应该出一份力来制止它.( so…that )
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