—Recent pressure at work may ______ his behavior.
--__________ was it_________ they discovered the entrance to the underground place?--Totally by chance.
The amount of money for the seriously sick child was soon collected.
Their tent,__________ light as a feather, remained firm in the storm last night.
--The news is spreading from mouth to mouth.--Yes, it has become__________ talk of__________ town.
Why haven't you finished your homework yet? You___________ to have finished it by last Sunday.