Industry is the key to success. (a) None can prosper in life without industry. (Affirmative) (b) Those who are idle, always lag behind. (Negative) (c) We have to work hard to earn money and acquire knowledge. (Interrogative) (d) The active person does not depend on others. (Interrogative) People say that hardworking persons can see the light of prosperity in life. (e) So, let us work hard. (Assertive)