单项选择题

(A number of) endangered (species) (increases) every year and natural (resources disappear).

A．A number of
B．species
C．representative
D．resigned disappear
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单项选择题
If someone (happens to call) while I'm (out), please have (them) leave a message (for me).
A．happens to call
B．out
C．them
D．for me
单项选择题
Not a single word ______ all morning.
A．did he say
B．he said
C．said he
D．does he say
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