chemical reaction / reaction, response / feedback

to react chemically / to respond, to react / be responsive, be sensitive

he; boyfriend

cow, bull, ox, cattle / beef / (astronomy) Ox

question, problem on homework etc. / a question; a matter (of time etc.) / a problem (something that needs to be dealt with); a trouble / an issue; a matter

China / to give something, to do something for someone

Japanese reading of the Chinese surname Wu. / the ancient State of Wu / (chiefly compounds) China, Chinese

(archaic) China, Chinese / a place name, such as that of Kure City in Hiroshima Prefecture

repeatedly

the moon / (astronomy) a natural satellite