The engine of the ship was out of order and the bad weather ________ the helplessness of the crew at sea.
Scientists say it may be five or ten years___________ it is possible to test this medicine on human patients.
My uncle___________ until he was forty-five.
--What ____________when I phoned you? ----I_____________and began to have a bath.
Sometimes words alone were not enough to _________pupils along the path of knowledge
Neither of them knew what was doing.