1.   The Chinese diet is considered to be the healthies in the world.

2.   The Chinese diet is considered to be the healthiest in the world.

3.   It's considered to be the healthiest diet in the world.

4.   The Chinese diet contains a lot of fruit and green vegetable, it's considered to be the healthiest in the world.

5.   The Chinese diet is considered to be the healthiest in the world.

6.   Spring is considered the best of the four seasons.

7.   Getting to know the world outside the campus is considered a necessily thing.

8.   It is considered that fresh water is not used up for ever.

9.   Water is considered to be next to oxgen in importance.

10.   Generally speaking, the global shortage of fresh water must be considered vital to man's pursuit of happiness.