Please write a clear (define) ________ for the word "deep".
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Coal mines are often ugly, and theri (develop) ________ has a serious effect on animal and plant life.
This is a new (discover) ________ in medical science.
It has been a long winter, and we are (eager) ________ waiting for the coming of spring.
They will have to be prepared to wait longer for (earn) ________ from this investment.