______ of them could solve the problem, so we turned to a third person for help.
--- Morning, class! Good luck to all of you in the exam! --- Morning, teacher. ________.
There ______ a group of people _______on the beach.
—youyour dictionary yet? —Yes, I , I it ten minutes ago.
_____of the warm water _____already been used up.
Stop cutting trees, _______ the earth will become worse and worse.