The coronavirus is a kind of virus. Viruses are tiny germs that are so small that you can’t see them. There are (18) ________  of different sorts of coronaviruses and some of them infect people. If you have been infected with one of these coronaviruses, all you probably had was a snotty nose or a cough.

Coronavirus germs live in people’s throats and mouths. When someone (19) ________  has the coronavirus coughs or sneezes or breathes out, the germs come out of their mouth in tiny drops of water.

Though you can’t see the germs, you can sometimes see these tiny drops. In cold weather, they make a cloud of steam! So if someone else (20) ________ breathes in the air with the coronavirus germs in it, they would probably get the illness.

It’s easy to get the coronavirus germs from inside your body on your hands (21) ________ you touch your nose or your mouth. If the person with the coronavirus germs on their hands uses a door, the invisible germs can live on the handle for hours. When someone else opens the door, they get the germs on their hands too. And if they touch their nose or mouth, the germs can get into their body.

18. A. lots                          B. lot                             C. few                           D. many

19. A. whom                      B. they                          C. who                          D. which

20. A. accidentally             B. generally                   C. decisively                  D. usually

21. A. what                        B. unless                       C. which                        D. when

Read the passage and choose the best answer for each question.