1, The reason was that he didn't want to make her worried. He didn't tell the truth for that reason.

→ He didn't tell the truth for that reason which was that he didn't want to make her worried.

2, The day was sunny. She arrived on that day.

→ She arrived on that day which was sunny.

3, I know the woman. You bought the car from her son.

→ I know the woman whose son you bought that car from.

4, Are you the man? The man won the first prize.

→ Are you the man who won the first prize?

Cần làm sáng tỏ hai luận điểm cơ bản:

Diện tích hình chữ nhật có cạnh chiều dài là 25cm, chiều rộng 13cm là: 

A. 2513 cm² 

B. 75 cm² 

C. 25 cm²

D. 325 cm²