Thay giống cũ bằng giống mới năng suất cao có tác dụng j?

Traffic in Vietnam is becomins worse,.You should write a paragraph about 130-150 words to give some solutions

Ai đó giúp mik với ạ

What does the doctor recommend to eat?

What do happy people do? 

What kind of food will help people to keep fit and stay healthy?