问题
填空题
根据所给词，将下列词分类，并在每一行的最后一格内再填一个相关词。
practice, sentence, cassette, comma, write, TV, video, frustrated,
grammar, speak, CD, learn, excited, pronunciation, ashamed, embarrassed
1. TV
2. speak
3. sentence
4. frustrated
答案
1. TV, cassette, video, CD
2. speak, practice, grammar, pronunciation
3. sentence, write, learn, word, comma,
4. frustrated, excited, ashamed, 
embarrassed