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I. Underline the silent letters in the words below. Doubt                foreigner                  awful                        Christmas Muscle              yacht                        vegetable                  pneumonia Wednesday       history                      design                       calm science              listen                          honest                      subtle plumber              psychology              wreck                        answer evening             handkerchief             exhaust                    receipt knee                 interest                       thought                     although island                neighbor                   walk                               honest ocean               vehicle                      literature                        ghost cupboard          autumn                    sword                           castle

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Tính giá trị của mỗi biểu thức sau: 72 288 + 1 656 : 24 = .........................................................                             = .........................................................                             = .........................................................                             8 527 + 1 197 : 19 = .........................................................                             = .........................................................                             = .........................................................                             27 294 + 3 280 : 40 = .........................................................                             = .........................................................                             = .........................................................                             6 881 + 2 921 : 23 = .........................................................                             = .........................................................                             = .........................................................                            

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