单项选择题

A．They should help maintain the equipment.
B．They should keep a watchful eye on their children.
C．They should stop their children from climbing ladders.
D．They should teach their children how to use the equipment.
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单项选择题
A．They haven’t been cleaned.B．There aren’t any available.C．They are always expensive,D．They are inexpensive now.
A．They haven’t been cleaned.
B．There aren’t any available.
C．They are always expensive,
D．They are inexpensive now.
单项选择题
A．The clay was placed in molds.B．Special tools were used to shape the clay.C．Each person was responsible for a particular part of the process.D．It was created on pottery wheels.
A．The clay was placed in molds.
B．Special tools were used to shape the clay.
C．Each person was responsible for a particular part of the process.
D．It was created on pottery wheels.
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