题目内容：

Mr. Robinson had to travel somewhere on business. As he was1.a hurry, he decided to go by air. He liked sitting beside a window when he was flying, 2.when he got onto the plane, he looked for a window seat. He found all of them already 3.(take) except one. There was a soldier sitting in the seat beside 4.. Wondering why this one had not been taken, Mr. Robinson at once went towards it.

When he reached it, however, Mr. Robinson saw that there was a notice stuck on the seat. It said, “This seat5.(keep) for proper load balance, thank you.” Because he had never seen such a kind of6.(usual) notice in a plane before, Mr. Robinson was a little surprised. But he thought that the plane must be carrying something 7.(particular) heavy in it, so he walked on and found8.empty seat, not beside a window, to sit in.

Two or three people tried to sit in the window seat beside the soldier, but they too read the notice and went on. When the plane was nearly full, a very pretty girl hurried into the plane. The soldier,9.was watching the passengers coming in, quickly took the notice off the seat beside his and in this way succeeded in having the company of a10.(beautiful) during the whole trip.