Question

Wus made
The first electric light ......... (make) by an English scientist named Humphry Davy
1800. He ....1.... (invent) an electric battery by ...2... (connect) wires to a battery a
a piece of carbon. This made the carbon glow, which ....3.... (produce) light. Arou
1860, the British physicist Sir Joseph Wilson Swan wanted ....4.... (create) a long-last
electric light. He ....5.... (find) that a carbon paper filament did the job, but it
(burn) quickly. Thomas Alva Edison ........ (experiment) with thousands of differ
filaments. In 1880, he discovered the right filament, which ........ (help) him to in
the light bulb.​

Answer 1

made
invented
connecting
produce

Answer 2

Answer:

1-made

2-experimented

3-helped