Charles Darwin, a young man just out of university, knew perfect well that he had to depend on _____ when he set out on a voyage of discovery around the world.
— Mum, many friends of mine are going to Hongenshi Park. Can I go too? — ________ Wait till you are old enough, dear.
— Why, David, you look so tired! — Well, I ________an article and I must finish it tomorrow.
George Washington selected the city the site of the US capital, but the name “District of Columbia” was chosen ________ Christopher Columbus.
— Sally, was ________ problem solved? — We were trying to think of ________ way out, but it was hard to find one.
Yao Ming made it clear that he would never consider retiring from the NBA he could recover his health.