Listening to and reading comparative word pairs (e.g., shed/shade)

What is the primary focus of Lesson 11 'Are You Listening?-1'?

In the sentence '$They were buying some \times papers \times and \times pens \times$', which underlined word has a vowel sound similar to 'test'?

In the sentence '$I \times met \times \times Benu \times and her room- \times mate \times in the book store$', which word has a different vowel sound compared to 'met'?