Нужно ставить: a,an.the 1)we have cat and dog . dog never bites cat. 2) i saw film last night . film was about beautiful girl . girl was very brave . 3) my dad has car . car is white . 4) i had sandwich and apple for lunch . sandwich wasn't very nice.

1)we have a cat and a dog . The dog never bites the cat.
2) I saw .a. film last night . .The film was about  .a. beautiful girl .   The girl was very brave .
3) My dad has  a car .   The car is white
.4) I had a. sandwich and  an. apple for lunch .  The sandwich wasn't very nice.