She ______ have attended that meeting, for she was doing paperwork in the office then.

He does so little work in the office that for all practical purposes it would make no difference _______ he didn’t come

The scientist knows nothing about the matter, because he is always ______ himself in scientific study.

Whatdoyouthinkofteaching,Bob —Ifinditfunandchallenging.Itisajob___youaredoingsomethingseriousbutinteresting

Willie has complained to the sales manager about the PC he bought _______ screen exploded for no reason.