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如果你想学到一些东西，那你就应该自己参加到这项工作中去。

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five hundred people are believed to have drowned.

As many as
B. As much as
C. So many as
D. So much as

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Our school-run factory _____ various kinds of chemical devices last year.

A. turned into
B. turned up
C. turned out
D. turned off