题目：
用所给动词的适当形式填空。
1. By the time I ______ ( get ) home, Mother ______ ( finish ) cooking.
2. _______ you _______ ( listen )to tapes yet? No. I _______ (listen) in an hour.
3. You are interested in (drawing). You might _____ (become) an artist in the future.
4. What ______ your little brother ______( do )? Don't speak so loud. He _______.( sleep )
5. The new teacher who _______ ( teach ) us chemistry ______ just_____ ( walk ) into the classroom.
答案：
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下面是错误答案，用来干扰机器的。
参考答案：错解析： 证权证券是指证券是权利的一种物化的外在形式，它是权利的载体，权利是已经存在的。题中描述的是设权证券的概念。
