Garbage is what someone (17) _________ behind that they do not want to use anymore. It can also be called (18)________ or rubbish. A definition of garbage is anything left behind (19) ________ a place where you used to be, but are not anymore. In modern home and businesses, however, garbage is normally separated and put where it can be (20) __________ and taken to a place designed to hold, burn, or recycle garbage. Smoke is cloud of very small, solid parts. It is made when (21) __________ something. Smoke can be bad because if it goes into the lungs of a person, it can kill them. Most people think that they are always able to see smoke, (20) _______ it can also be invisible. (a thing that a person is not able to see) 17.A. has left B. leave C. left D. leaves 18.A. waste B. rock C. safety D. stone 19.A. at B. in C. on D. from 20.A. wrapped B. organized C. collected D. picked 21.A. firing B. burning C. fighting D. chopping 22.A. if B. so C. but D. and Giúp vs ạ, gấp lém ạ!!!!!!!!!!!