(¡¡¡¡)1. It is requested that a lecture ________ on this subject.

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(¡¡¡¡)2. The teacher forbade the students to let ________ fireworks in the school.

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C£® down¡¡¡¡                       D£® off

(¡¡¡¡)3. In order to spread the news, the school put ________ a notice on the wall.

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(¡¡¡¡)4. It was along the Mississippi River ________ Mark Twain spent much of his childhood.

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