Use the past simple or past continous.
Natural rubber is difficult to use in its original state. It melts in the heat and breaks when it is cold. For many years Charles Goodyear (1) _____ (TRY) unsuccessfully to transform natural rubber into a substance that stayed strong and fexible at different temperatures. He (2) ______ (WORK) in his workshop one cold winter's evening when he (3) _______ (MAKE) an amazing discovery. He (4) ______ (STAND) near his stove because of the cold. He (5) ________ (EXAMINE) a piece of sulphur-covered rubber when by accident he (6) _______ (DROP) it onto the hot surface. Incredibly, the rubber (7) _______ (MELT) and (8) ______ (BECOME) a small flat disk that was both strong and flexible. He (9) _________ (PUT) it outside in the freezing cold. The following morning he (10) ______ (NOTICE) that the disk still (11) ________ (HAVE) the same qualities as the night before.
Natural rubber is difficult to use in its original state. It melts in the heat and breaks when it is cold. For many years Charles Goodyear (1) _____ (TRY) unsuccessfully to transform natural rubber into a substance that stayed strong and fexible at different temperatures. He (2) ______ (WORK) in his workshop one cold winter's evening when he (3) _______ (MAKE) an amazing discovery. He (4) ______ (STAND) near his stove because of the cold. He (5) ________ (EXAMINE) a piece of sulphur-covered rubber when by accident he (6) _______ (DROP) it onto the hot surface. Incredibly, the rubber (7) _______ (MELT) and (8) ______ (BECOME) a small flat disk that was both strong and flexible. He (9) _________ (PUT) it outside in the freezing cold. The following morning he (10) ______ (NOTICE) that the disk still (11) ________ (HAVE) the same qualities as the night before.
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2. was working
3. made
4. was standing
5. was examining
6. dropped
7. melted
8. became
9. put
10. noticed
12. had