This is one of the experiments __________ in our laboratory.
What do you think of the reason _____ he gave at the meeting yesterday?
_____ is no doubt _____ Jennifer will come to see me this weekend as usual.
The reason ____he was late was ____he had taken a wrong bus.
Did John ____ the general cleaning yesterday afternoon?
He was educated at a famous university, _____ he went abroad and settled there.