30. Please ___ the toilet after use. So the restrooms are not smelly.
(A) blush
(B) flush
(C) slush
(D) plush
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統計: A(87), B(209), C(28), D(60), E(0) #2240991
統計: A(87), B(209), C(28), D(60), E(0) #2240991