The wreckage of something like a jet plain discovered in the heart of the desert is believed ______ a UFO and _______down for reasons still mysterious.
________you the truth, she knows nothing about it.
-Who were those people with the flags? -A group________ itself the League of Peace.
Many teachers were praised at the meeting, Mr. Zhou________.
________with fright, a hungry fox hid himself in a small cave, ________his tail to the rain.
________from what he said, he must be the thief who has stolen the car.