先阅读短文，掌握其大意。然后从方框中所给的词中选出恰当的10个，并用其适当形式填空，每个词限用一次。(每小题1分)
| stop, though, sleep, their, bad, city, ill, we, start, fresh, please, breath |
Villagers are healthier than people who live in towns. One reason for this is that country air is
56 than the air in smoky 57 . The villager is 58 fresh clean air all day in the fields, but the air the townsman breath is always full of smoke and dust. We cannot live without air. If we are 59 from breathing even for five minutes, we will die. Bad air means bad health and certain kinds of 60 , which may kill us, 61 they may not kill us at once.
We all know 62 feelings we will get if we stay a long time in a shut, crowded room. After a time, we begin to feel very 63 , and can hardly keep our eyes open. Then our heads begin to ache, and the longer we stay the 64 we feel. How nice it is when we get outside into the fresh air! We must, therefore, keep 65 windows open, so that air in our rooms is always fresh.
56. _______ 57. _______ 58. _______ 59. _______ 60. _______
61. _______ 62. _______ 63. _______ 64. _______ 65. _______