1. It is considered one of the strongest tropical cyclones ever observed 

Dẫn chứng: Super Typhoon Haiyan is one of the strongest tropical cyclones ever observed.

2. The another name of Typhoon Haiyan is Yolanda

Dẫn chứng: Recovery from the monster typhoon, locally known as Yolanda, would be long and difficult.

3. It was widespread and disastrous 

Dẫn chứng: It ripped through the Philippines, and the destruction across the islands was disastrous and widespread

4. About 9.5 million people have been affected by the typhoon

Dẫn chứng: About 9.5 million people have been affected by the typhoon.

`1.` It is considered one of the strongest tropical cyclones ever observed 

Dẫn chứng: câu đầu tiên đoạn 1

`2.` It is Yolanda

Dẫn chứng: câu cuối đoạn cuối

`3.` It was widespread and disastrous 

Dẫn chứng: dòng 2 câu 2 của đoạn 1 

`4.` About 9.5 million people have been affected by the typhoon

Dẫn chứng: About 9.5 million people have been affected by the typhoon.