One day last week I went a walk in the country.                                       1.       

In the morning the weather was well and the sun was                                           2.       

shining;the sky was blue and there were no could.                                         3.       

Soon a cool wind started blown and black clouds                                          4.       

were covered the sun and then it started to rain.                                           5.       

There were no houses in sight,but I got very wet.                                          6.       

After a hour or so,I managed to catch a bus which                                        7.       

took me home.But when I arrived I was shivering                                         8.       

and I knew I had caught a bad cold.I must                                                   9.       

have taken my coat.I had nothing to do but to                                              10.       

stay at home and wait for a doctor.

画出被截切圆柱体的第三面股影，并整理轮廓线。