帮忙解决英语

您好
我是北外英语专业的3年级学生
我的答案是
1.What _a____ beautiful horse it is!
2.Look,there's ___an__ elephant walking down the street.
3.You should take this medicine twice ___a__ day.
4._____The young should take good care of ___the__ old.
5.Einstein is one of ____the_ most famous scientists in ____the_ world.
6.He goes to work in ____the_ morning and goes home in ___the__evening.
7.Our teacher's office is on __the___ fourth floor.
8.I have __an___ idea.Let's go on ____a_ picnic on Saturday.
9.Did you have fun at __the___ picnic yesterday?
10.Everyone knows Kitty is __an___ honest girl.
^_^

a
an
a
The, the
the, the
the, the
the
an, a
the
an

1.a
2.an
3.a
4.The the
5.the the
6.the the
7.the
8.a a
9.the
10.a

a 就是后面的名词不是元音字母开头的
an 就是后面跟的名词或者形容词是以元音开头的
the 就是特指

1,a
2,a
3,a
4the the