`2`. Câu có trong bài : 

`→` First, sport keeps people active and this is more important for older people who have greater health problems. 

`4`. Câu có trong bài :

`→` Many elderly people say they are lonely. When you join a team, you can make friends. 

`5`. Câu có trong bài :

`→` To sum up, sport is good for everybody, but particularly for older people.

`7`. Câu có trong bài :

`→` In addition, sport is a social activity.

$#Zen$

$\text{2.}$ 

→ Dẫn chứng : First, sport keeps people active and this is more important for older people who have greater health problems. 

$\text{4.}$ 

→ Dẫn chứng : Many elderly people say they are lonely. When you join a team, you can make friends. 

$\text{5.}$ 

→ Dẫn chứng : To sum up, sport is good for everybody, but particularly for older people. 

$\text{7.}$ 

→ Dẫn chứng : In addition, sport is a social activity.

$\Rightarrow$ Các câu 2,4,5,7 được đề cập đến trong đoạn văn 

$#Keisha$