51.

1. one's
2. their
3. his
4. human

52.

1. partial
2. independent
3. peculiar
4. definite

53.

1. believing in
2. profiting
3. cultivating
4. resorting

54.

1. for
2. in
3. into
4. over

55.

1. put
2. get
3. handle
4. give

56.

1. storage
2. tendency
3. threat
4. obstacle

57.

1. chase
2. thrust
3. strengthen
4. urge

58.

1. uphold
2. freeze
3. affect
4. perfect

59.

1. projects
2. warnings
3. decision
4. proposals

60.

1. insuring
2. going through
3. exceeding
4. stimulating

(Reference keys.)