Can you tell me the        difference between the words “require” and “request” ? I sometimes get puzzled by their meanings.

Our country are working even harder now to _______ the gap between the developed countries and ours.

If you follow a diet expert’s advice, eating more can mean losing _____weight rather than less.

There is a ______ table in the middle of the room.

In the history of Chinese revolution, Taierzhuang Battle was a ________ battle in which both sides suffered heavy losses.