Believe it or not. My grandpa , 95 years old now, ________World WarⅡ.

---- Have you ______ some new ideas? ---- Yeah. I’ll tell you later. 

He was so____ a key university that he would work until late into the night.

If better use ______your spare time，you’ll make good progress in doing your business.

 As I didn’t feel better, my doctor __________me to take a holiday by the sea.