8. My parents have been married for nearly twenty years,and they (never argue) with each other once.
4. ―You have made great progress in your study of English? haven't you? 一Yes,but much ( remain;do) .
8. My parents have been married for nearly twenty years,and they (never argue) with each other once.
4. ―You have made great progress in your study of English? haven't you? 一Yes,but much ( remain;do) .