字头Q
quality - n. that which something is known to have or be ("An important quality of steel  is its strength."); amount of value or excellence ("Their goods are of the highest quality.")

question - v. to ask; to express wonder or disbelief; n. a sentence or word used in asking for information; a problem; an issue to be discussed 

quick - ad. fast 

quiet - ad. with little or no noise; having little or no movement; calm 
 
字头R
race - v. to run; to take part in a competition to decide who or what can move fastest;  to take part in a campaign for political office; n. one of the major groups that humans  can be divided into because of a common physical similarity, such as skin color

radar - n. a device that uses radio signals to learn the position or speed of objects that may be too far away to be seen 

radiation - n. waves of energy from something that produces heat or light; energy from a nuclear substance, which can be dangerous 

radio - n. the system of sending and receiving signals or sounds through the air without wires 

raid - v. to make a sudden attack; n. a sudden attack carried out as an act of war, or for the purpose of seizing or stealing something

railroad - n. a road for trains; a company that operates such a road and its stations and equipment 

rain - n. water falling from the sky 

raise - v. to lift up; to move to a higher position; to cause to grow; to increase 

rare - ad. not common; not usual; not often 

rate - n. speed; a measure of how quickly or how often something happens; the rice of any thing or service that is bought or sold 

reach - v. to put a hand toward; to arrive at; to come to 

react - v. to act as a result of or in answer to 

read - v. to look at and understand the meaning of written words or numbers 

ready - ad. prepared; completed; organized; willing 

real - ad. true; truly existing; not false 

realistic - ad. in agreement with the way things are 

reason - n. the cause for a belief or act; purpose; something that explains 

reasonable - ad. ready to listen to reasons or ideas; not extreme; ready or willing to compromise 

rebel - v. to act against a government or power, often with force; to refuse to obey; n. one who opposes or fights against the government of his or her country 

receive - v. to get or accept something given, offered or sent 

recent - ad. a short time ago 

recession - n. a temporary reduction in economic activity, when industries produce less and many workers lose their jobs 

recognize - v. to know or remember something or someone that was known, known about or seen before; to accept another nation as independent and establish diplomatic ties with its government 

record - v. to write something in order to have it for future use; to put sound or pictures in a form that can be kept and heard or seen again; n. a writing that shows proof or facts about something 

recover - v. to get again something that was lost, stolen or taken away ("The police recovered the stolen money."); to return to normal health or normal conditions ("She is expected to recover from the operation.") 

red - ad. having the color like that of blood 

reduce - v. to make less or smaller in number, size or amount; to cut 

reform - v. to make better by changing; to improve; n. a change to a better condition 

refugee - n. a person who has been forced to flee because of unjust treatment, danger or war 

refuse - v. to reject; to not accept, give or do something 

regret - n. a feeling of sadness or sorrow about something that is done or that happens 

reject - v. to refuse to accept, use or believe 

relations - n. understandings or ties between nations; members of the same family; people connected by marriage or family ties 

release - v. to free; to permit to go; to permit to be known or made public 

religion - n. a belief in, or the honoring of, a god or gods 

remain - v. to stay in a place after others leave; to stay the same 

remains - n. a dead body 

remember - v. to think about the past; opposite forget 

remove - v. to take away or take off; to put an end to; to take out of a position or office 

repair - n. work done to fix something 

repeat - v. to say or do again 

report - v. to tell about; to give the results of a study or investigation; n. the story about an event; the results of a study or investigation; a statement in which the facts may not be confirmed 

represent - v. to act in the place of someone else; to substitute for; to serve as an example 

repress - v. to control or to restrict freedoms by force 

request - v. to ask for; n. the act of asking for 

require - v. to need or demand as necessary 

rescue - v. to free from danger or evil 

research - n. a careful study to discover correct information 

resign - v. to leave a position, job or office 

resist - v. to oppose; to fight to prevent 

resolution - n. an official statement of agreement by a group of people, usually reached by voting