Q
Qualify, quality, quantity, quarrel, quarter, question, quick, quickly, quiet, quietly, quit, quite, quote
R
Race, racial, radical, radio, rage, railway, rain, rainy, raise, ramble, random, range, ranger, rank, rape, rapid, rapidly, rarely, rate, rather, ratio, rational, raw, reach, react, reaction, read, readily, reading, ready, real, realistic, reality, realize, really, reason, reasonable, recall, receive, recent, recently, reckon, recognize, recommend, record, recorder, recover, recovery, recreation, recycle, red, reduce, reduction, redundant, refer, reference, reflect, reform, refuse, refusal, regain, refresh, regard, regardless, region, register, regret, regular, regularly, regulation, reinforce, reject, rejection, relate （注意该词的词义）, relation, relative/related, relax, release, relevant, reliable, relief, relieve, religion, reluctant, rely, remain, remark, remarkable, remedy, remember, remind, remote, remove, render, renew, rent, repair, repeat, repeatedly, replace, replacement, reply, report, represent, representative, reputation, request, require, rescue, research, reserve, resemble, resident, resign, resist, resolve, resort, resource, respect, respective, respond, response, responsible, rest （注意该词的跨词类用法）, restore, restrain, result, resume, retail, retain, retire, retirement, return, reveal, review, revive, revolution, reward, rewarding, rid, ride, ridiculous, right （注意该词的跨词类用法）, right-handed, ring, rise, risk, risky, rival, river, rock （注意该词的跨词类用法）, rocket, romantic, room （注意该词的词义）, root, rope, rough, roughly, round, rubber, rubbish, rude, ruin, rule, run, rural, rush