I think you are irregular in studies. Be attentive lest ______

There are many obstacles in our way to success. We must work hard so that we can achieve our goals

Jamil had an accident yesterday while he was driving to work

There goes a proverb that  a man is known by the company he keeps So, we should make friendship with a gentleman.

Corruption is a bottleneck to our national development. It is high time  we took strong measures

He, who studies hard and remains dedicated, makes a glorious result in the examination.

Whenever he speaks in English,  he makes some mistakes Infact, we learn through mistakes.