We watched as the plane ________behind the clouds.
A. lost
B. vanished
C. escaped
D. flew
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Nowadays, people in the city enjoy a ________ of recreational(娱乐) life.
A. variety
B. range
C. extent
D. variation
The hopes, goals and fears ________ widely between men and women, the rich and the poor, the old and the young.
A. alter
B. shift
C. transfer
D. vary
He wasn't interested in politics until he was old enough to ________.
A. choose
B. vote
C. elect
D. register
She ________(sail) the boat without any help