The retired professor, _____ in his new book in the past three years, hasn’t realized the decline in his health.
I'll lend you my car __________ you return it in time.
At least twenty people were injured in the car accident, three children __________.
Little Johnny felt the bag, curious to know what it __________.
Many people have come to realize that they should go on __________ balanced diet and make room in their day for exercise.
In education there should be a good __________ among the branches of knowledge that contribute to effective thinking and wise judgment.