The Titanic, the biggest ship of its day, ____ unsinkable, but it sank on its first voyage in 1912.
— Mr. Smith was really helpful when you were in financial difficulty during those years. — Definitely. I can never appreciate his kindness _____.
People hope to become more _____ in predicting earthquakes.
We had a really bad time about six months ago but now things are _____.
— What's the matter with you, Lucy? — After the long walk, my legs _____ and I couldn't go any farther.
The task _____ more difficult than we expect.