____, he does not know the answer.
Knowledgeable as he is, the expert was unwilling to offer advice to ______ he thought was not qualified.
Don’t ______ life’s small joys while searching for the big ones.
Delta, the American airline, is sometimes jokingly explained “Don’t expect your luggage to arrive” because it ______ be very slow.
Life is more than merely trying to achieve thestandards of society but trying to be a good person ______ one’s own standards.
______ herself in looking after the newly-born twins, she had to sacrifice her career to stay with her kids.