In a time of social reform, people’s state of mind tends to keep _______ with the rapid changes of society.
He wrote a lot of novels, none of _____ translated into a foreign language.
He had a lot of friends, but none of _____ could lend him any money.
He had a lot of friends, none of _____ could lend him any money.
He studied as hard as he could _____ to enter a good college.
He ran as fast as he could _____ to catch the bus.