根据图画选择恰当的单词或短语(其中有一个选项是多余的)。(共10分，每小题1分)
They got water ________ the river nearby. A．with B．by C．from
He lived ________ a big cave. A．inB．onC．at
Peking Man lived about 300，000 ________ 500，000 years ago. A．from B．toC．for
What's your mother's ________？ A．work B．do C．job
What class are you ________？ A．at B．in C．on
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