Question

Countable and uncountable nouns

Answer 1

A/an : veggieburger, baked potato , sausage
Some + plural noun: biscuits, peas, vegetables
Some + uncountable noun: sugar, sauce, rice

Answer 2

1. a veggieburger, a baked potato, 
2. some biscuits, some vegetables, some peas
3. some sauce, some rice, some sausage, some sugar