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Wang Kun and Wang Wei are brother and sister. They have dreamed of 【小题1】(take) a great bike trip.It 【小题2】(be) Wang Wei who first had the idea to cycle along the Mekong River. They rode bicycles to travel along the Mekong River,【小题3】source is in Qinghai Province.When it【小题4】(enter) Southeast Asia,it travels 【小题5】(slow) through hills and low valleys and the plains【小题6】rice grows.Despite the difficulties,Wang Kun and Wang Wei 【小题7】(determine) to begin their journey at 【小题8】altitude of more than 5,000 meters in Qinghai Province.During their journey, they enjoyed the continuous change of the weather.Finally, they reached Dali in Yunnan Province,【小题9】which Dao Wei and Yu Hang joined them.The four of them went on with 【小题10】(they) great bike trip.