Trả lời những câu sau( thành bài thuyết trình - mỗi câu 1 bài )

trl nhx câu sau( thành bài thuyết trình - mỗi câu 1 bài )
1.talk about one kind of pollution
2.how to protect the environment
3.talk about a natural disaster
4.how to reduce pollution at your school
5.the importance of learning a new foreign language
6.what are the advantages and disadvantages of using mobile phone