单项选择题

All _______ is a continuous supply of fuel oil.

A．what is needed
B．that is needed
C．the thing needed
D．for their needs
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单项选择题
Today dozens of scientific group in different countries have been _______ the goal of a practical and economic way to use sunlight to split water molecules.
A．reaching
B．winning
C．chasing
D．pursuing
单项选择题
It is necessary that an efficient worker _______ his work on time.
A．accomplishes
B．can accomplish
C．accomplish
D．has accomplished
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