单项选择题

Dozens of scientific groups all over the world have been ______ the goal of a practical and economic way to use sunlight to split water molecules.

A．pursuing
B．chasing
C．reaching
D．winning
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单项选择题
Water will continue to be ______ it is today—next in importance to oxygen.
A．how
B．which
C．as
D．what
单项选择题
Mr. Wells, together with all the members of his family, ______ for Europe this afternoon.
A．are to leave
B．are leaving
C．is leaving
D．leave
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