They became good friends during the war, and since then their lifelong friendship has______ tests of life and death.[ ]

It is necessary to explain your theory _____, otherwise the audience won’t make sense of what you are trying to get across

When I said someone broke the school regulations, I ______ youWhy did you get that angry?

The Rio 2016 Olympic torch （火炬） began _____ 95-day journey in Brazil on May 3rd.

Do you have _____ eraser