阅读下面短文，并用英语回答问题(请注意每小题后面的词数要求)。

Jack wants to climb mountains with his friends. They need to buy some things. They come to a supermarket. Jack wants to buy a pair of blue sports shoes. It's $35. "I have $50. It's enough," Jack thinks.

Dale wants to buy a hat. The white hat is nice and it's only $12, but it is small for him.

"What about this black one? It's $18, " David says to Dale. "Great! I'll take it," Dale says.

David wants to buy some food. "I'll buy some milk and pears for us," he says. "Pears are too heavy. How about some small tomatoes?" Jack says.

"That sounds good!" says David.