(63)
A.at
B.by
C.during
D.after

(65)
A.at
B.for
C.about
D.with

(67)
A.ability
B.capability
C.property
D.competence

(69)
A.as
B.such
C.like
D.for example

(70)
A.realizes
B.determines
C.recognizes
D.identifies

(72)
A.tell
B.differ
C.vary
D.say

A.gemstone
B.considerate
C.ultimately
D.profitable

A.charged
B.replaced
C.laughed
D.watched

BEHAVE
A.behavioural
B.behavior
C.behaved
D.behaving

USE
A.usage
B.useful
C.useless
D.usefully