完形填空(共20小題;每題1.5分，共30分。)
通读下面的短文，掌握其大意。从每小题的四个选项中选出可填入相应空白处的最佳选择，并把它前面的大写字母填入左边括号里。
Mr. Jones woke early one morning， before the sun had risen. It was a beautiful morning， _1_ he went to the window and looked out. He was _2_ to see a neatly-dressed and mid-aged professor， who _3_ in the university just up the road from Mr. Jones‘ house， coming the direction of the town. He had grey hair thick glasses， and was _4 an umbrella， a morning newspaper and a bag. Mr. Jones thought that he must have _5_ by the night train _6_ taking a taxi.
Mr. Jones had a big tree in his garden， and the children had tied a long 7_ to one of the branches， so that they could swing on it.
Mr. Jones saw the professor _8_ when he saw the rope and looked carefully up and down the road. When he saw that there was _9_ in sight， he stepped into the garden (there was no fence)， put his umbrella， newspaper， bag and hat nearly on the grass and _10_ the rope. He pulled it _11_ to see whether it was strong enough to take his weight， then ran as fast as he could and swung into the _12_ on the end of the rope， his grey hair blowing all around 13_. _14 he swung， sometimes taking a few more _15_ steps on the grass when the rope began to swing _16 slowly for him.
_17_ the professor stopped， straightened his tie， combed his hair carefully， put on his hat， _18_ his umbrella， newspaper and bag， and continued _19_ his way to the university， looking as _20_ and correct and r...