I’m impressed with his determination. When he had a problem to solve, he _____ work at it until he found an answer.
The most important _____ of his speech was that we should all work whole-heartedly for the people.
When I worked as the general manager of the firm, I sometimes had _____ to visit London on business.
As civilization______, more and more people have realized the importance of preserving rare animals from extinction.
Although I had read the book assigned by the professor several times, it didn’t make any______ to me.
A(n)______ is a person who understand people’s characters.