31.   Even naming a favourite actor is difficult as he racks his brain trying to think of one.

32.   Officials are racking their brains for ways to raise money.

v. + brain >>共 336
have 6.74%
pick 3.86%
use 3.86%
affect 3.14%
rack 2.88%
damage 2.52%
reach 2.25%
enter 2.07%
stimulate 1.98%
blow 1.53%
rack + n. >>共 38
brain 38.10%
body 8.33%
world 3.57%
country 3.57%
pipe 3.57%
area 2.38%
face 2.38%
province 2.38%
bike 1.19%
campus 1.19%
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