根据下列句子的汉语意思和英文提示，完成句子（每空一词，共10分）
小伙子们，请注意听！去那条河里游泳是危险的。
Boys, please _____ up! It’s dangerous _____ go swimming in that river
我妹妹基本没能理解你对她所说的话。
My little sister could hardly understand _______ you said ________ her.
别担心，有三个中国姑娘在照看她们。
Don’t worry. There _______ three Chinese girls __________ after them.
我宁愿去科学博物馆，而不愿去公园。
I’d like to go to the Science Museum ________ ________ go to the park.
昨天我在街上碰到了一个老朋友.
I ______ _______ one of my old friends in the street yesterday.