单项选择题

The children are to do their homework the moment they（）back school.

A．have arrived
B．had arrived
C．will arrive
D．would arrive

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单项选择题

The ancient Chinese coins had a square hole in the center because（）

A．it would be easier to put them together and carry them around
B．it would be lighter for people to carry them from place to place
C．people wanted to make it look nicer
D．people wanted to save the expensive metal they were made from

单项选择题

If you had to buy something expensive, even gold and silver were inconvenient because（）

A．they are easy to steal
B．they are difficult for people to obtain
C．they are not easy to carry around
D．they themselves are expensive, too