A.invest
B.major
C.perform
D.machine

A.example
B.consider
C.several
D.attention

A.restaurant
B.assistance
C.usually
D.otherwise

A.obvious
B.probably
C.finally
D.annoying

When I realized I was wrong. I apologized to him about my mistake.
A.realized
B.to
C.about
D.mistake

A.physical
B.achievement
C.government
D.national

A.conference
B.lecturer
C.reference
D.researcher

A.requirement
B.condition
C.example
D.previous

A.interviewee
B.refugee
C.understand
D.referee

A.mathematics
B.engineering
C.scientific
D.laboratory