Mr. Jones woke early one morning, before the sun had risen. It was a beautiful morning, _1
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 respectable as one would expect a professor to be.
_1_ he went to the window and looked out
A.because
B.as
C.so
D.for