题目内容：

    Last year I came across a polar bear face to face. That day, we travelled for six hours there to watch the largest land predator in the world-the polar bear.

The bus suddenly came to a _______ and the engine wouldn't start. Then in the distance appeared a polar bear. _______ by nature, it was walking towards us. My pulse quickened. I could hear my heart _______ in my ears.

He came closer and his long nose moved back and forth, checking out the  _______ on the bus door. He walked around the bus, then, without _______, jumped up suddenly on his legs and put his front feet _______ the bus, his sharp paws _______ on the white metal door repeatedly. With his head only four feet from the open windows, he looked up at the faces which stared  _______ at him.

To get a good position to take a _______, I climbed up the outside metal balcony (平台)on the bus. The bear had moved towards my end of the bus, but his ____________ was under the balcony, leaving most of its back part outside.

Suddenly, I heard a loud noise from under my feet. I looked down. In a hurry, I had not ____________ the floor of the balcony was a see-through metal grid(网). The polar bear was ____________me. His wet nose almost touched my feet. He looked up at me with his brown eyes, ____________ he wanted to say something. ____________ , I was aware the fact that I was in this bear's territory.

I waited in the freezing Arctic wind, watching him walk away slowly. Just before disappearing behind the snowdrift, he ____________ and looked back at me for one final goodbye. And then I got a perfect photograph.

1.A.use B.life C.stop D.power

2.A.Patient B.Nervous C.Friendly D.Curious

3.A.flying B.beating C.burning D.struggling

4.A.smells B.tastes C.paints D.colors

5.A.effort B.shame C.warning D.doubt

6.A.beyond B.against C.behind D.beside

7.A.drawing B.resting C.focusing D.clicking

8.A.back B.forwards C.away D.around

9.A.research B.picture C.break D.walk

10.A.tail B.paw C.nose D.head

11.A.admitted B.noticed C.explained D.minded

12.A.attracting B.saving C.striking D.smelling

13.A.in case B.if only C.even if D.as if

14.A.Naturally B.Hopefully C.Carefully D.Strangely

15.A.swam B.welcomed C.paused D.shouted