1. important =crucial (extremely important)，significant(amount or effect large enough to be important)

　　2.common=universal, ubiquitous(if something is ubiquitous, it seems to be everywhere)

　　3.abundant=ample(enough and usually extra)， plentiful(enough for people's needs and wants)

　　4.stick=adhere, cling(hold on something tightly)

　　5.neglect=ignore。(difference: neglect means someone has not paid enough attention to something; ignore means no attention。)

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