1. I was so________the night before my examination that I could not sleep.
2. Whether you learn or not is entirely ________ you.
A. up to
B. as to
C. about to
D. due to
3. I finally________ to study much harder in the future.
B. made up my mind
C. worked out
D. made out
4. The old couple decided to________ a boy though they had three of their own.
5. The population of the world is growing at a dangerous________.