BÀI 10. CHỌN CÂU TRẢ LỜI ĐÚNG
5.a.At the moment, I am writing a letter for my grand mum.
b. At the moment, I am writing a letter to my grand mum.
5.a.At the moment, I am writing a letter for my grand mum.
b. At the moment, I am writing a letter to my grand mum.