The days are gone________you can breathe fresh,unpolluted air or drink clean, unpolluted water in the countryside.
He studied as hard as he could _____ to enter a good college.
He ran as fast as he could _____ to catch the bus.
I’d try even if I may fail ___ __ sit there worrying in time of trouble.
—Ms Lin looks rather a kind lady. —But in fact she is cold and hard on us. You ____believe it!
I have no dreams ____ to have a happy life.