thì có theo 1 quy luật đâu -> Số thập phân vô hạn ko tuần hoàn-> vô tỉ

1, Phuong has a brother , Nam .

\(\Rightarrow\) Phuong is Nam's sister .

2, We have some buy book .

\(\Rightarrow\) We don't buy food .

4, I think he .....( do nate) blood several times before .

\(\rightarrow\) will donate

5, The children ......( not/finish) painting the mural over .

\(\rightarrow\) don't finish

6, We ......(not/complete) cleaning up the streets yet .

\(\rightarrow\) haven't completed

He sent a letter to his penpal last week .

\(\rightarrow\) He didn't send a letter to his penpal last week .