You shouldn't eat so (a)   sweets.

My friend doesn't eat (a)   fruit.

They don't know (a)   about the history of their country.

I don't have (a)   time to practise basketball.

There aren't (a)   people in the shops today.

There is not (a)   homework to do.

How (a)   of you are coming to the party?

We don't have ...... oranges, and we don't have ...... olive oil.

(a)  

There wasn't (a)   dust in that house, was there?