1._The_ Greens are on _a_ visit to a beautiful city in China.
2.After school I usually play _the_ piano for about _an_ hour.
3.Henry’s father died in _the_ autumn of 1999.
4.__The___ woman over there is __a___ popular teacher in our school.
5.__The___ old with white hair spoke _____ English well at __the___ meeting.
On __a___ cold morning,I went into __a___ big sports shop because I wanted __a___ sports bag.__An___assisatant came up to me,and I told him what I wanted.__The___assistant brought me three different bags.I chose __the___ smallest one and paid for it.__The___ assiant put ___the__ bag in __a___ large plastic bag for me and then I left __the___ shop.
冠词：第一次用a,an;以后用the
其总的用法：泛指---单数用a,an；复数---不用冠词
特指---单复数都用the