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.   Spring is considered the best of the four seasons.

6.   I consider you buy this book in the bookshop.

7.   So if he is vegetarian he will consider an ad about meat products useless for him.

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

9.   So we don't consider it necessary to save water.

10.   They consider that fresh water can be got from the rain, the river , the will , etc. and these resources of fresh water will never dry up, so they can use fresh water freely as they want.