Liu lived in a small village. The nearest big city (1) ___many kilometres away. Although his brother (2) ___in the city, Liu (3) ___never there until recently. Last month his brother died and he (4) ___a trip to the city for the first time in his life. He (5) ___hardly believe what he (6) ___. He (7) ___many things that he (8) ___never before and (9) ___many things that he (10) ___never before. For example, one day his nephew(11)___ , him to the biggest department store in the city. They (12) by bus. As he (13) ___ never in a bus before, he (14) ___it a new experience. They (15) ___off the bus and (16) ___to cross several streets to get to the department store. Liu (17) __very upset when he (18) ___such heavy traffic there. Even when the green traffic light (19) ___on, he (20) ___not cross. He (21) ___never traffic lights before and he (22) ___no idea what they (23) ___for.