XIV)
1 . Traffic jam is one of the most common issues in big cities all over the world
( One of + tính từ so sánh hơn nhất + N (số nhiều))
2 . Doing a lot of sports will help you concentrate at school
( V-ing đứng đầu câu đóng vai trò làm chủ ngữ )
3 . We had better keep our body warm to avoid catching flu or a cold
( had better + Vinf )
4 . It is easy to start a diet but remember to be much harder to keep it
5 . The festival shows cultural richness of this country
