51.

1. regularly
2. eventually
3. commonly
4. continually

52.

1. as far as
2. as long as
3. as well as
4. just as

53.

1. public
2. tournament
3. competition
4. retirement

54.

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

55.

1. wrapping
2. wrapped
3. having wrapped
4. having been wrapping

56.

1. undergo
2. underestimate
3. overestimate
4. reject

57.

1. given away
2. given in to
3. given rise to
4. given up

58.

1. do with
2. do without
3. do away with
4. have something to do with

59.

1. torture
2. torment
3. despair
4. languish

60.

1. cooperative
2. coordinated
3. collaborative
4. coefficient

(Reference keys.)