Verified answer

A. 1. a. polite

b. impolite

2. a. impatient

b. patient

3. a. mature

b. immature

4. a. perfect

b. imperfect

5. a. impure

b. pure

B. 1. often

2. just

3. so

4. then

5. forever

C. 1. from / to

2. from / to

3. from

4. to / from

5. from