The book _____ he bought yesterday is very interesting.
—Will you be _____ this afternoon, John? —It depends. I’m afraid I’ll be called in by my manager.
—Do you think we should put an ad in the paper for the lost child? —Yes, ______.
The key to our success was having the courage to take on any job and then being creative in our ____ to getting it finished.
Though it is the first time they have met, they talked as if they _____ friends for many years.
A clean environment can help the city bid for the Olympics, which ______ will promote its economic development.