Match the sentence to the term that it illustrates.
1.my mother—what a pianist—taught me all i know about music.
a parenthetical expression
2.yes, i feel that water color is an exciting hobby for an artist.
a sudden break in thought
3.as if he had never seen one before, jerry stared at the beautiful pyramid.
an appositive
4.cambodia, an interesting country, is located in southeast asia.
an introductory interjection
5.the eustachian tube is, of course, essential for correct hearing.
an introductory adverbial clause

1. a parenthetical expression

Explanation:

What a pianist  is on a comment and it's  separated with dashes, a parenthetical expression.

2. an introductory interjection

Explanation:

Yes  is an introductory interjection, used to show ecxitement.

3. an introductory adverbial clause

Explanation:

The sentence has an inversion with the dependent adverbial clause  starting the sentence, it has a comma and, then, the independent clause.

4. an appositive

Explanation:

The words an interesting country  (an appositive) are adding information about the noun Camboja.

5. a sudden break in thought

Explanaton:

The words of course are used for a sudden break of thought, and don't alter the meaning of the sentence.

the maximum speed limit is 55 mph on a two-lane undivided highway and for vehicles towing trailers.