题目内容
Streams, _______flow through wetland before they reach a lake or a river.
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Though there are more eatable plants, there may also be wild animals, poisonous snakes, and other________.
A 9-year-old girl in New Mexico has ______more than $500 for her little brother who needs heart surgery in Houston Texas this July.
We have Quartz crystal clocks and watches accurate to_____ one minute a year.
A rat or pigeon might not be the obvious choice to tend to someone who is sick, but these creatures have some _______ skills that could help the treatment of human diseases.
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