A.in which
B.on which
C.to which
D.by which

A.Did you have No.4 cylinder repair
B.Do you have No.4 cylinder repaired
C.Didn’t you have No.4 cylinder repairing
D.Didn’t you have No.4 cylinder repaired

A.then
B.than
C.when
D.after

A.stopping
B.being stopped
C.to stop
D.to be stopped

A.open
B.uncover
C.covered
D.closed

A.the engine stopped
B.the engine was stopped
C.he stopped the engine
D.he had stopped the engine