51.

1. with respect to
2. in accordance with
3. due to
4. thanks for

52.

1. what
2. that
3. which
4. when

53.

1. acquire
2. master
3. transfer
4. share

54.

1. prey
2. pray
3. prawn
4. peer

55.

1. appraise
2. applaud
3. apparent
4. appropriate

56.

1. as many as
2. as much as
3. so many
4. so much

57.

1. intelligent
2. individual
3. collective
4. particular

58.

1. constitute
2. composes of
3. consist with
4. consist of

59.

1. concepts
2. connotations
3. cognitions
4. consumptions

60.

1. number
2. quality
3. property
4. efficiency

(Reference keys.)