Which sign is made for safety?
There are _______ in the reading room, but many of those books aren’t _______ to read.
It’s generous _______ him to give so much money to charities. Now he thinks it's important _______him to help people in poor areas.
－Could you please tell me where __________? －Sure. He is in the office.
－Is that Mary?－No, it _______be her. She has gone to Tokyo.
－How tired we are!－Yes. ______we have math tests, _______we have physics tests. So many tests.
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