Câu hỏi:

What is the most well-known __________ invention in the 19th century?

A __________ guide is a person employed to show tourists around places of interest.

We would take part in the competition if the prize __________ bigger.

His father is going to repair the bike for him soon.

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Find and correct the mistakes

Find and correct the mistakes?

Playing badminton __________ so interesting that we play it three times a week.

Read the following passage, and answer the questions that follow

Ohio

In 1878, Thomas Edison began serious research into developing a practical incandescent lamp and on October 14, 1878, Edison filed his first patent application for "Improvement In Electric Lights". In 1879 he created a successful incandescent light bulb. This was his hardest project – from 1877 to 1880, Edison and his assistants tried around 3000 experiments to perfect their light bulb design. By the end of 1880, Edison had produced a bulb that lasted 1500 hours. This discovery marked the beginning of commercially manufactured light bulbs and in 1880, Thomas Edison’s company, Edison Electric Light Company began marketing its new product.

How many hours did the 1880 bulb last?