An important part of a teacher’s monitoring system is his/her record of work completed or skills mastered?

It is skills mastered

Explanation:

It is skills mastered because you can get as much work done as possible but being able to master a topic is what counts in the end.

line 5 is one of them idk the other one

in the following paragraph, the fourth sentence the correct answer is: three personal subject pronouns

”she was embarrassed when she found that they had been put back on the shelves…”

a   subject pronoun is a personal pronoun. i, you, he, she it, we, they.  

in the sentence it can be observed she, used twice and they used once. is for this reason that is a three personal subject pronoun sentence.