A study shows that walking fast in your old age is a ______ that you will live a long life.
Susan decided not to work on the program at home because she didn’t want her parents to know what she_____.
----Did you tell Julia about the result? -----Oh, no, I forget. I _____her now.
After the long journey, the three of them went back home, ______.
He _________ to go through the hard times and finally became a famous artist.
It is well known that biology is ______ science about living things.