Morphemes which represent such grammatical categories as number, tense, gender, and case are called _______ morphemes. ( )

单项选择题The sounds that begin and end the words church and judge are voiceless and voiced ______,respectively. ( )

单项选择题There is a difference between what we know, which is our linguistic competence, and how we use this knowledge in actual speech production and______, which is our linguistic performance. ( )