51.

1. complaint
2. anxiety
3. grief
4. conflict

52.

1. convert
2. associate
3. orient
4. familiarize

53.

1. refuse
2. welcome
3. deliver
4. withdraw

54.

1. why not
2. whatnot
3. when not
4. where not

55.

1. as much
2. as such
3. as well
4. as if

56.

1. on
2. with
3. as
4. for

57.

1. on the level of
2. in accordance with
3. by means of
4. in view of

58.

1. adjusted
2. modified
3. rejected
4. removed

59.

1. from behind
2. from under
3. out of
4. away from

60.

1. guest
2. target
3. host
4. master

(Reference keys.)