Active vs. Passive

Active vs. passive
Would you change the following sentences? If not, why not? Rewrite those that need clarification.

1. The points of the lecture were quickly learned by the students, but they were also quickly forgotten.
changed to: The students quickly learned and forgot the points of the lecture.

2. Later in the day, the employees were informed of the layoffs by the boss himself.
changed to: Later in the day the boss informed employees of the layoffs.

3. With five seconds left, a three-point shot was missed by LeBron James.
changed to: LeBron James missed a three-point shot with five seconds left.

4. Participants in the survey were asked about their changes in political affiliation.
changed to: Participants answered questions about their changes in political affiliation.

5. Tall buildings and mountain roads were avoided by Raoul because he had such a fear of heights.
changed to: Raoul avoided tall buildings and mountain roads because of his fear of heights.

6. The bill is being considered by the Legislature.
changed to: The Legislature is considering the bill.

7. The practice of covering up mistakes has been pursued by the government.
changed to: The government practices covering up mistakes.

8. The class is reading the book.
not changed