閱讀下面材料，在空白處填入適當(dāng)?shù)膬?nèi)容（1個單詞）或括號中單詞的正確形式。

Wild rice is not 1.___________ (actual) a member of the rice family, although it is a grain-producing grass. Native to North America, this grain can2._________ (find) growing wild in the ponds and lakes of Wisconsin, as well as in neighboring states. Like rice, wild rice grows in water, but it requires much 3.__________ (deep) water than rice does.

Wild rice is very difficult to harvest because its stalks(稈) are so crispy 4.___________ many types of equipment cannot be used. It takes patience and hand work 5.___________(harvest) wild rice. As a result, this grain is expensive and often difficult to get.

Like other grains, its chaff(谷殼) must be separated 6.___________ the grain. It is harvested green, and after being separated, it may be set out to dry to prevent it from7.___________(go) bad.

Wild rice is quite sensitive to changes in the environment. With the widespread use of dams(水壩) in the United States, many areas 8.___________ wild rice once grew have not been able to keep their former populations of the grain. This is 9. ___________ pity for people who enjoy the crop. Many native people hold the grain in high respect and they support the 10. ___________(produce) of this special rice.

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