A best friend is one who can always read your minds when you are at a loss for the ________ words to complete your thoughts.
He ______ English for six years by the time he takes his examination.
George has arrived, but I did not know he ______ until yesterday.
It ______ six years since they last saw each other.
Look at these clouds. ______.
-- Could you give these books to Mr. Mackintosh? -- Certainly, ______ him about something else in any case, so it won't be any bother.