Experiments of this kind __________ in both the U. S. and Europe well before the Second World War.
— Remember the first time we met, Jim? — Of course I do. You __ in the library.
The vegetables didn’t taste very good. They__too long.
— Was the driving pleasant when you went to Mexico last summer? — No, it __ for four days when we arrived, so the roads were very muddy.
I used to drink a lot of tea but these days I __coffee.
Look at this! I__some magazines and__this letter.