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| Peter and Bill were good friends. One day they 1 to go on vacation to the seaside together. The seaside was more than 100 kilometers 2 . The roads were good, so they didn't think it would be 3 . "We'll go by bike," Peter said."We'll buy a bike. We have got enough 4 to pay for it.""Let's buy a tandem (双人自行车)," Bill said."It'll be 5 than buying two bikes." Peter thought it was a good 6 , so they bought a tandem and soon learned 7 to ride it."I'll sit on the front seat," Bill said,"and you can sit 8 me." All went well for most of the journey(旅程) to the seaside. Then they had to climb a hill. Slowly, they went up the hill. When they got to the top, they stopped. Bill was hot and 9 ."Wow!" Bill said."It was very difficult." "I know," Peter said, "and if I hadn't kept the brake(闸) on, we would have now rolled(滚) 10 the hill." | ||||
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