In each of the following questions a grammatically correct and meaningful sentence is given with four words given in bold in each. Which of the following words should replace each other to form a meaningful and grammatically correct sentence. The meaning can be different from the one in question. After you believe (a), you need to commit time to learning-say an hour every day to explore (b) that new software at your workplace and finally, you will repetition (c) in engage (d) and application of the new knowledge to convert it into a skill.