單項選擇題This is one of the most important things （） all.
A.among
B.in
C.of
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1.單項選擇題Tom is a person who always （） up to dangers.
A.meets
B.faces
C.sees
2.單項選擇題He worked in this company （） several years.
A.in
B.since
C.for
3.單項選擇題The （）of employees in this company has doubled.
A.sum
B.amount
C.number
4.單項選擇題The Europeans （）to stay ahead in aeroplane design.
A.failed
B.missed
C.lost
5.單項選擇題Mary （） into the room.
A.burst
B.crashed
C.hit