用a或an填空.1.There are sixty minutes in_____hour.2.-Can I help

1.an
2.a
3.an a
4.an
5.a

1.There are sixty minutes in__an ___hour.
2.-Can I help you,madam?
-I'm looking for___a ___pair of shoes for my daughter.
3.This is___an __empty bottle.Could you give me____a __full one?
4.There is____an ___apple and some pears on the table.
5.-Where is Xiao Ming?
-He's having__a___rest over there.

1,an
2,a
3,an a
4,an
5,a