_______ he met with the difficulty did he realize the importance of our help.
--- Where did you get to know him?--- I think it was in the factory______ I worked ten years ago.
—Why does the lake smell terrible?—Because large quantities of water .
—Hi, Tom, why are you looking so tired?—I'm tried. Because I ______ the living room all day.
__________ is troubling me is __________ I don’t understand __________ he said.
______________________, I would have given you his address.