Viết lại câu sao cho nghĩa không đổi:
1.We have to keep our school green, clean and attractive
=>It's our duty
2.I could not go to school yesterday. I was ill
=>Because I
3.Mr.Thanh couldn't enjoy the meal because of the stomachache
=> the stomachache
4.What is your daughter's age, Mrs.Mai?
=>How
5.You shouldn't eat too much meat
=>You'd
6.How heavy is the chicken?
=>What