Such a person _____ you talked about is seldom seen now.

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

.—This _____ John’s house .It’s number101. — Idon’t think so.He said a large white house but this is a small yellow one.

washing machine apile of dirty clothes, and on the floor of the sitting room were newspapers,magazines and waste paper

The climbers succeeded in climbing to the top of the mountains, and they owed their success to the preparations they ______