3. The shoes in that shop ______ very expensive, weren't they? – No, they ______.

Explanation:

This task requires completing sentences in the past tense using the verb 'to be'. The first blank refers to 'The shoes', which is plural, so we use 'were'. The second blank is a negative answer to the question, referring to 'they' (the shoes), so we use 'weren't'.

Answers:

1. The shoes in that shop were very expensive, weren't they? – No, they weren't.