I had forgotten the date of that important battle so I _____ a history book.
--why don’t we choose that read to save time? --The bridge to it ________.
Many people in the west make ________ a rule to buy Christmas presents for their relatives and friends.
They were all very tired, but ________ of them would stop to take a rest.
Come and see me whenever ________.
--The plane is due to take off at 7∶50 from the airport. --________ we fail to arrive there in time?