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, (22)__________ 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

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