单项选择题

The children ______ before they work in the Restaurant.

A．must be trained
B．must be over seven years old
C．should know how to read and write
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单项选择题
To dry the wet pages, Richardson ______.
A．leaves them in the sun
B．places them on a sheet of glass
C．puts them between sheets of dry paper
单项选择题
Richardson mends old books ______.
A．in a hospital
B．in a library
C．at home
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