Do you remember the farm ______ keeps many kinds of animals——Yes. It is a lonely place that few people want to go to.

I have trouble _______ my new computer.—Don’t worry. I’ll show you how _______it.

I found him sitting in his chair,completely_____ a magazine.

I was surfing the Internet my brother was doing his homework.

Only under special circumstances ______ to take those rests.[ ]