The common cold is familiar to everyone. People often catch cold in __1_ winter or spring. They may __2_ catch cold at other times __3_ the year. A person with __4_ bad cold usually buys some __5_ of medicine. Pharmacies have many __6_ for a cold. However, doctors __7_ that these medicines do not __8_ very much. They that __9_ person with a bad cold __10_ stay in bad, keep warm, and drink a lot of water.
In 1928 an English doctor was working in his laboratory in <<<>>> hospital. The doctor‘s name _11_ Alexander Fleming. One day he _12_ a tiny bit of mold (黴) _13_ a dish that he was _14_ in his work. He started _15_ throw the mold away. Then _16_ noticed that it seemed unusual. He _17_ the mold and studied _18_ for a long time. He _19_ that it could kill germs. He _20_ it penicillin.