----It’s a long time since I saw Kevin. What has happened to him?----Well, to tell you the truth, he _______ for nearly a month.
________ all over the hills and around the lake are wild flowers of different kinds.
I think that this meal was well worth ________ was charged for it.
—The experiment is of particular importance. —I see. We will carry on with it ________ we can get enough money.
When people move to another country, they often try ________ the customs of their native land.
Although punctual himself, the professor was quite used ________ late for his lecture.