Answer:
10). Principal - How much is the <u>principal</u> on that loan?
11). Which - Peter didn't know <u>which</u> was his.
12). Intensive purposes - For all <u>intensive purposes</u>, the test is over.
13). Yourselves - You can make <u>yourselves</u> at home.
14). levee - The <u>levee</u> could not hold back the flood.
<u>Sentence Structure:</u>
15). On a cloudless night, I studied Pisces, a constellation in the North sky.
16). Those people look very confused.
17). Did you hear the Denver Broncos won the Monday Night Football game? The poor Kansas City Chiefs can never catch a break.
18). I have taken notes on your book; however, I still have questions.
19). Carlotta and I love Halloween.
20). Carol has a piano lesson tomorrow.
21). John announced, "The library is closing in five minutes."