51.   Mystery surrounded the whereabouts Monday of Defense Secretary William Perry, who returned to Washington over the weekend after postponing a trip to Saudi Arabia.

n. + surround >>共 893
police 10.67%
troop 4.34%
force 3.56%
soldier 2.22%
controversy 1.84%
people 1.63%
dozen 1.57%
mystery 1.49%
water 1.28%
hundred 1.25%
mystery + v. >>共 127
be 50.22%
surround 7.47%
remain 6.00%
deepen 4.39%
begin 1.61%
have 1.46%
continue 1.32%
end 1.17%
solve 1.02%
start 0.88%
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