Here’s a completed version of the dialogue:

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David: Sorry, I’m late. There’s **lots of** traffic today.

Mary: Don’t worry. Let’s have a cup of tea.

David: Great!

Mary: **How much** sugar do you have in tea?

David: **A lot**. I love sugar.

Mary: **How many** teaspoons of sugar, then?

David: Five.

Mary: Really? Oh, no. There isn’t **much** milk.

David: There’s **a little**. That’s enough for us. Are there any biscuits?

Mary: Let’s see. There aren’t **any** biscuits, but there are **a few** cupcakes. Would you like one?

David: Yes, please.

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Feel free to adjust any parts if needed!