No nation can develop without education. So, it is rightly said that ____.

Most of the rivers are getting polluted day by day. It is high time we stopped water pollution / to stop water pollution.

Explanation- [ It is high time Sub+V2.... or to + V1......]

Milk is rich in food values. We should take milk everyday so that we can keep our body fit

Mr. John is very interested in tourism. He wants to visit Bangladesh with a view to enjoying the natural beauty of the country.

Explanation- With a view to + V+ ing…………..

I like to play cricket in my leisure time. When I get a chance, I play cricket with my friends / I rush to a cricket field.

Mina really sings well. If she gets opportunity, she can become a famous singer [Zero conditional]

He was a petty clerk. But he behaved as though he had been an officer. 

[unreal condition had been হবে]