.
It was _____ his mother came in _____ to prepare his lessons.
| A．not until; did the boy begin | B．until; that the boy didn’t begin |
| C．until; did the boy not begin | D．not until; that the boy began |
The _____ language used in most international organizations is English.
| A．official | B．native | C．frequent | D．separate |
--- Hello! Is Mr. John in the office?
--- Yes. But I’m sorry. He is busy _________ and can’t speak to you.
| A．at once | B．at present | C．at the end | D．at first |
As a young man, there was __________ time __________ I hated to go to school .
| A．a; that | B．a; when | C．the; that | D．the; when |
—I am leaving for the States tomorrow, Caroline!
—______
| A．Take your time. | B．That’s OK. | C．Well done! | D．All the best! |
As we all know, many Chinese words have come into English, _____ typhoon, tofu and kung fu.
| A．for example | B．that is | C．such as | D．so as to |