Unit 4 I have a pen palPart C 练习一、按要求填空。1. teach (三单式)______ 2. swim(现在分词)______ 3. dance (现在分词)_______4. do(三单式)_______ 5. throw (过去式) _______二、根据句意及首字母提示填写单词。1. I want to go h__________ next Sunday.2. My h_________ is singing.3. They like English. S...