Unit 51. In a way I prefer shopping online because it is more convenient and saves time.在某种程度上，我更喜欢网上购物，以为内她更加方便而且节省时间。2. The success of mechanical in discovering reliable and useful laws of nature suggested to Galileo that all nature is designed in accordance mechanical laws.力学中一些可信的有用的的自然定律的成功发现启发了伽利略：整个自然与力学定律我协调一致的。3. A vacancy exist for a sales manager at our pairs office .if youre interested in it, please send useful an application letter and you resume at once.在我们的巴黎办事处有个销售经理
