(a) Fill in the blank with preposition: Poverty is a hindrance_________our development.

(b) Transform the following sentences as directed: Walking is the best exercise for the old (comparative).

(c) Use the right form of verb: I have never (regret) my penny dreadful period.

(d) Substitute the following for a single word: Murderer of one's own mother.

(e) Correct the following sentence: Napoleon was defeated in the war of Waterloo.