根据句意及所给汉语提示,完成下列单词。
—Look! It ________________ be Kitty in the classroom.
—It ________________ be her. Because I saw her in the library a short time ago.
若|a→|=5,b→与a→的方向相反,且|b→|=7,则a→=____b→.
蝗虫的发育过程是( )