Tom kept quiet about the accident ____ lose his job.

In a few years, China will be able to produce camera recorders on a large ______.

When I dropped in, Dr Smith _____, so we only had time for a few words.

Of all the books Dickens wrote, Oliver Twist is probably ________ famous one.

I went to the classroom to close the door yesterday. But as soon as I was _______ to the classroom, I found it already _______.