A.painted;topaint
B.ispainting;painting
C.paint;topaint
D.have painted;to paint

A.operating
B.to be operated
C.to operate
D.operated

A.kind
B.type
C.sort
D.category

A.turn over
B.turn up
C.turn on
D.turn down

A.business
B.accident
C.matter
D.event

A.command
B.commanding
C.to command
D.commanded

A.this opportunity
B.a chance
C.this time
D.aperiod

A.in case
B.in the case
C.in case of
D.in the case of

A.back
B.up
C.off
D.down

A.took place
B.occurred
C.broke out
D.happened

A.to do
B.and to do
C.and do
D.and doing