Alexander Graham Bell (invent) ___________ the telephone when Thomas Edison (complete) ___________ his second model of the phonograph in 1887.
had invented _ completed
National Geographic, one of the most influential magazines, (appear) ___________ in 1899, which (help) ___________ to increase readers' cultural awareness and understanding through high-quality photo essays
appeared _helped
The lung cancer mortality rate (rise) ___________ six-fold in males when mass media (start) ___________ covering the health risks of smoking.
had risen___started
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