Exercise:

1a.

Exercise:

1b.

Exercise:

2.

Exercise:

3.

Exercise:

4.

Exercise:

5a.

Exercise:

5b.

Exercise:

5c.

Exercise:

5d.

Exercise:

6.

Exercise:

7a.

Exercise:

7b.

Exercise:

7c.

Exercise:

7d.

Exercise:

8.

Exercise:

9a.