I can't _ him in the knowledge of wild plants．As a matter of fact, he' s an expert．

The Chinese University of Hong Kong, founded in 1963, ______ 50 in 2013.

Recently our class held a fierce ________ as to whether to raise the price of school meals or not.

-- I’m going on a vacation. You can’t imagine 6 months of hard work without rest.-- You certainly _____ a good rest.

Though John and David are twins, yet they differ widely _______ character.