【题目】We require that he ______ all night.

【题目】Men must consider eating, drinking, clothing and finding shelter _____ they can pursue entertainment and recreation.

【题目】Sometimes, the kind of food we serve a person suggests _____ we show our gratitude.

【题目】I regret ______ to come to your birthday party yesterday.

【题目】—I heard Mr. Morgan would be here at 4:00 pm. next Thursday.

【题目】Repairs of historic buildings have to be _____ the original structure.

【题目】I wonder why Jenny ________us recently.We should have heard from her by now.

【题目】After nine years working to protect Siberian tigers, Yang Jun _____ his efforts recognized at the annual award ceremony in Beijing where he was named a "wildlife protector".

【题目】--- Each of the students, working hard at their lessons, ______ the book.

【题目】The emoticons _____ when we want to stop a conversation, sparing us the embarrassment.