题目

I had a friend who visited me from out of town and I wanted to show him the CN Tower. It was one of the tallest structures on the earth. So I thought it would offer a(n) __21__ sight. We were standing in line for 45 minutes to enjoy the __22__ up to the watch point. When we got there, we went around the __23__ of the tower and saw the hard wire fence __24__ to the structure serving as a barrier. We went back inside to look for the glass floor that provided a direct view __25__. As soon as both of us __26__， we stopped before walking onto it. We found that our legs began to __27__. I 看谁算得又对又快．120÷20= 180÷30=360÷40= 124÷20≈181÷30≈ 363÷40≈