–What do you think of teaching, Bob?–I find it fun and challenging. It is a job ___ you are doing something serious but interesting.
All of the guests by 9 o’clock , but the host until 15 minutes later .
Mike didn’t notice Alice entering his room. He ____ a phone call.
—Did you find the missing couple in the mountain yesterday?—No, but we ________ to get in touch with them ever since.
—Such a mistake could have been avoided. —Unfortunately, he _______ the mistake again and again.
—May I remind you that a Mr. Wang is waiting outside, sir?—Oh, that’s right. I about it.