Setze "a" oder "an" ein.

Beispiel: 2/week  -  twice a week.

Jake´s father is a doctor.
Jake´s father is doctor.
Lucy has got brown eyes.
Mum helps Grandma three times day.
Dogs are animals.
She is shop assistant.
She must send her teacher email.
There is problem with the computer.
We enjoy visiting foreign countries.
What great DVD!
Jake loves playing computer games.