A.compulsory
B.suitable
C.alternative
D.optional

A.related
B.dependent
C.based
D.associated

A.in brief
B.in sequence
C.in short
D.in particular

A.relaxed
B.casual
C.indifferent
D.flexible

A.overtook
B.undertook
C.underwent
D.withstood

A.compel
B.compress
C.enforce
D.reinforce

A.forged
B.formed
C.framed
D.formatted

A.possibility
B.control
C.influence
D.pressure

A.debate
B.dispute
C.argument
D.quarrel

A.connection
B.association
C.bearing
D.reference

A.discarding
B.streaming
C.shedding
D.flowing