根据所给提示，完成句子。每空一词，含缩略词。

小题1:Mary and Tom are used to living in this big city now. (改为否定句)

Mary and Tom                         to living in this big city now.

小题2:Students should learn everything by thinking alone. (对划线部分提问)

____________ ____________ students learn everything?

小题3:At first, Teresa was too nervous to talk in front of the class. (改为同义句)

At first, Teresa was              nervous            she couldn’t talk in front of the class.

小题4:Sara’s hair is too long. She needs to cut her hair. (合并为一句)

Sara needs to             her hair            .

在我国大部分地区，一天中气温一个最低值出现在（）．

A.0时

B.日出前

C.日出后

D.14～15时