.As reported in the essay by Prof. Brown, it is only in the most difficult circumstances ________ a man’s abilities are fully tested.

The view is common all our neighborhood.[ ]

Mr. Li, can you repeat it again? I’m ____ slow to write down all the main points.

_______ do you read English newspapers? —I read 21st Century every day. [ ]

What do you usually do _____ your computer? —I usually chat _____ QQ friends online. [ ]