Since the baby milk powder was found to be polluted, there has been universal doubt _____ other food products are safe _____.
He arrived here at noon, ____in the day, and he went out and came back in the day.
Has all that ____ without delay ____ yet?
_______ different life today is ________ what it was 30 years ago.
A man may usually be known by the books he reads _____ by the friends he keeps.
Although he is often tired _____ his work, he is never tired _____ his job. In fact, he enjoys it.