Only when _________________.
—Would you mind me opening the window,sir?—________.I am feeling a bit chilly.
Look! There are lots of ________ birds flying over the trees.
The old rules have to be ______ because they only applied to the circumstances that existed when they were made a hundred years ago.
—Have you figured out how much the tuition is in American universities?—$19 000 or ________ like that.
)We pursue happiness,thinking one day we will find it.But_________it by seeking it.