Verified answer

b

1 a receipt

2 to exchange

3 a refund

4 goods / products (товары)

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b

To describe a problem more politely we use

a bit + negative adj.

not very + opposite positive adj.

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с

1) a bit dirty, not very clean

2) not very fast, a bit slow

3) not very polite, a bit rude

4) a bit cold, not very warm

Примеры:

This cap's a bit dirty.

The barman's not very polite.