—You were brave enough to argue with Mr. Smith.      —Well, now I regret _______ that.

______ around the Water Cube, we were then taken to see the Bird’s Nest.

At the age of 29, Dave was a worker,  _____ in a small apartment near Boston and ______ what to do about his future.

I never thought of it before, _______ all that my parents had done for me for granted.

The trees     by the Japanese visitors are growing well.