COMPLETE THE FOLLOWING SENTENCE WITH A OR AN

COMPLETE THE FOLLOWING SENTENCE WITH A OR AN.
1.-It is____an___ lovely day.
2.- It is_____an_____ old university.
3.- He is __ an______ unusual man.
4.- It is ____a_____ exception to the rule.
5.- It is____a____ long trip, but it is __ an____ easy trip.
6.- It is __a____ large library.
7.- It is____an___ugly hotel-
8.-It is____a_____pear.
9.- He is____an____ honest man.
10. She is ___an____ happy child.
11.- The car is ___an___ used car.
12.- It is __a___ tall tree.
13.- It is ___an___ egg.
14.- It is __an____ Apple.
15.- It is ___a____ old bus.
16.- It is __a_____ empty bottle.
17.- It is __an______ hour till lunch.
18.- It is ____a___ windy day.
19.- The gift is __an_____ new book.
20.- It is ___a___ one- story building.