Time plays a very crucial role in human life. We cannot prosper in life unless _______ . (Complete the sentence with suitable clause/phrase)

Rudaba could not recognise me at first. It was many years since we had last met.
 

Student politics, now a days, has become a serious issue. It is high time we we reformed it for the betterment of education .

A newspaper is a storehouse of knowledge. A man can be benefited in many ways by reading it regularly / if he reads it regularly .

Traffic jam in Dhaka has been unbearable these days. Had I got a Helicopter, I could have reached my class on time .

A book fair is an attraction for the city-dwellers. Book-lovers gather in the fair so that they can buy their favourite books .

Our college has the best teachers of the country. The teachers are not only highly educated but also devoted to teaching .