The experiment, though they had tried their best, ________ to be a failure.
Fishing is his favorite hobby, and _______.
There are five pairs _______, but I’m at a loss which to choose.
—What do you think made Mary so upset? —_______ her new bike.
When I handed the report to John, he said that George was the person _______.
She looks forward every spring to _______ the flower-lined garden.