Tìm lỗi sai và sửa lỗi: 41/ In the past, jeans wore mostly by working people. 42/ Most of the money today is made from paper and metal. 43/ Some doctors advise me to go bicycling because it is one from the safest forms of exercise 44/ He left for London last year. Nobody saw him since. 45/ Nowadays a lot of dangerous work are carried out by robots. 46/ I was watching an international football match by the TV when he came. 47/ The police are looking at two missing pupils. They were last seen yesterday morning. 48/ Do you finish with the book I lent you last week? 49/ Because the heavy rain, many people arrived at the meeting late. 50/ Nobody can find the key. The key couldn’t be found. Help mee~