Cú pháp hàm tính trung bình là A. =MAX(a,b,c,…)  B. =SUM(a,b,c,…) C. =AVERAGE(a,b,c,) D. =MIN(a,b,c,…)

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?