Fill in the article a, an or the where necessary. Choose x where no article is used.
1)Their car does 150 miles ___ hour.


2)Where's ___ USB drive I lent you last week?


3)Do you still live in ___ Bristol?


4)Is your mother working in ___ old office building?


5)Carol's father works as ___ electrician.


6)The tomatoes are 99 pence ___ kilo.


7)What do you usually have for ___ breakfast?