Directions: Each sentence below has a blank space indicating that something has been left out. Following each sentence four words are given. Choose the word that makes the sentence meaningful.
(a) John was so good at mathematics that his friends considered him to be a ________.
(1) Profligate
(2) Prodigy
(3) Prodigal
(4) Primeval
(b) His __________ of the topic was so good that students had few doubts to raise at the end.
(1) exposition
(2) picturisation
(3) clarity
(4) exposure