51.

1. specifically
2. purposely
3. particularly
4. passionately

52.

1. from
2. of
3. at
4. in

53.

1. kill
2. starve
3. abuse
4. worsen

54.

1. When
2. While
3. As
4. Since

55.

1. lost
2. derived
3. generated
4. synthesized

56.

1. what
2. why
3. how
4. which

57.

1. good
2. high
3. lower
4. poor

58.

1. represent
2. make
3. present
4. exert

59.

1. medication
2. illusion
3. motion
4. action

60.

1. habit
2. behavior
3. disorder
4. pattern

(Reference keys.)