“Just a couple of hours, ” said Dad, “and we’ll be at our campsite !” The year was 1950 and we were on our family　 21　 ,doing what we usually did together- camping. I 　22　 in my corner of the back seat to take a nap. The rhythm of the 　23　 car soothed(哄) me into a 　24　 sleep.

Wham ! I 　25　 with a start, my face on the floorboard of the back seat. Dad had 　26　 the car suddenly. “ What happened ? ” I asked. “Where are we ?” “ Half an hour from our 　27 　,” he answered, “and I don't know what the problem is,　 28 　all the cars have stopped . I’ll go to see what’s going on.” Dad 　29　 out of the car. Mom ,my little brother David and I 　30 　. “ I bet there has been an accident !” David was excited. Mom 　31　 her head. She said, “ There is　 　32 　a bear crossing the road.” David bounced up and down in his 　33　 . That was even better than a(n) 　34　 !

Dad came running back to the car. “ Come on !” he said very 　35　 . “Come on, kids ! You’ve got to see this!” I jumped out of the car and ran to catch up with him. “What is it, Daddy?” I asked. He smiled and 36 　my hand. “Come and see, Carolyn,” he said. I knew that, 　37　 it was, it was good, because my father was

38 　about it . I grabbed his hand and skipped excitedly along beside him. We walked past a dozen parked cars. 　39　 ,a group of people stood talking and laughing.

Looking in the same direction as everyone else, we saw a mother duck, sleek and proud, walking up the middle of the road, nine little ducklings waddling 　40 　her. The babies were marching single file behind their mother, totally ignoring the people and the automobiles.

20. You need a password to get ______to the computer system.

19. I was lost in the strange city; ______it began to rain heavily.

18. -Did you pass the oral exam yesterday ?

-No, without luck. How I wish I ______ the pronunciation.

17. ______ I attended the lecture, I ______a good knowledge of how this happens now.