51.

1. careful about
2. capable of
3. accessible to
4. susceptible to

52.

1. in the event
2. in an attempt
3. at the moment
4. along the way

53.

1. exclusive
2. very
3. just
4. exact

54.

1. indeed
2. however
3. moreover
4. therefore

55.

1. demonstration
2. dimension
3. destiny
4. determination

56.

1. has been said
2. being said
3. was said
4. is said

57.

1. more or less
2. pretty much
3. as ever
4. if any

58.

1. while
2. despite
3. nevertheless
4. since

59.

1. case
2. mold
3. sense
4. condition

60.

1. different
2. similar
3. insufficient
4. significant

(Reference keys.)