It’s high time we our attention to this problem.
His uncle gave him books to read, but after a page or two he would put __book down and pick up__ new one.
A non-smoker can hardly imagine__ pleasure of having__ smoke after a meat.
.They have their reasons for keeping their marriage___ secret for ___ moment.
He had decided to give it up , but on____ second thoughts he decided to try___third time.
.As is known to all,____ tiger is in____ danger of dying out.