Walking and running are the oldest and newest, excellent _________ exercise for all ages and fitness levels.
– Mary didn’t attend the lecture, did she? -- Yes, she ______.
– Will you waste your time and money on that? -- Certainly _______.
Although ______ to stop, he kept on working.
– I won’t do it any more. --_______?
-- My cat’s really fat. --- You ______ have given her so much food.