Open the brackets using Past Simple. Write down only the verb. Mum and Dad ... (buy) a lot of food.

Solution:

The task is to conjugate the verb 'buy' in the Past Simple tense. The sentence is 'Mum and Dad ... (buy) a lot of food.' Since 'Mum and Dad' refers to multiple people, we need the past tense of 'buy'. The past simple form of 'buy' is 'bought'.

Therefore, the completed sentence is: Mum and Dad bought a lot of food.

Answer: bought