Her question was so difficult that I could hardly make any _______ of it at all.
My chest _______ when I make a deep breath, doctor.
--- How can I use i Phone 5s? --- Just refer to the _________.
What I need is book that contains ABC of oil painting.
---Have you read the book? ---Yes. But that one is _____worth reading. I suggest you______ it if you have time.
_____the problem of land erosion getting more serious, the government is searching for a way to deal with it.