根据句意和汉语注释，写出单词的正确形式。
【小题1】As we know, oil always floats (漂浮) on water.
【小题2】He nodded (点头) to me in greeting when I entered the room.
【小题3】We are very proud (自豪) that a pupil from our school has won the prize.
【小题4】They all hurried upstairs (往楼上) to see what was going on.
【小题5】There was silence (沉默) for a moment and then someone made a useful suggestion.
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解析：
【小题1】考查时态。根据always可知，用一般现在时。故填floats。
【小题2】考查时态。根据entered可知，用一般过去时。故填nodded。
【小题3】考查固定句型。be proud of/that从句，“以......而自豪”。故填proud。
【小题4】考查副词。hurry to“匆忙赶往”，upstairs“楼上”。故填upstairs。
【小题5】考查there be句型。there was后跟名词。故填silence。