单项选择题
A．in a special way B．over a very short distance C．by a musical instrument D．at a rather slow speed
A．All small acts will add up to kindness. B．It’s a small act to help a person in need. C．Everyone can play his own part to make things better. D．You should be kind to your neighbors and they will treat you the same way.
A.contribute B.contributed C.contributes D.contributing