He must have been ill, or he ________ to the lecture then.
It remains __________ whether this teaching method will be better than that one.
It was not until midnight __________ they reached the camp site.
His album won several awards at the music festival,__________ was beyond his wildest dream.
The young man we followed stopped and looked as if __________ whether he was going in the right direction.
__________ untidy, his bedroom needs doing out.