单项选择题

The vast ______ area of this country enabled us to welcome the hordes of immigrants that flocked to our shores.

A．teeming
B．explored
C．flourishing
D．undeveloped
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单项选择题
My mother tried to ______ a little money each month for his summer vaction.
A．put forward
B．set aside
C．bring about
D．make for
单项选择题
The pilot made an unexpected ______ because of engine trouble.
A．conclusion
B．crash
C．victory
D．landing
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