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Nearly a billion mobile phones _____ every year worldwide.

• are sold
• is sold
• sell
• sold

The first mobile phone call _____ in 1973 by Martin Cooper.

• was made
• were made
• made
• is made

He _____ an inventor for a leading mobile phone company.

• was
• were
• has been
• was been

The call _____ by the boss of a rival company, who was not happy to hear that he had lost the race.

• was answered
• answered
• was answer
• were answered

The first mobiles _____ by batteries that weighed nearly a kilo.

• were powered
• was powered
• powered
• are powered

Voicemail _____ to phones in 1986.

• was added
• added
• were added
• was add

Internet access _____ for another ten years.

• was not added
• were not added
• did not added
• did not add

The first text message _____ in December 1992.

• was sent
• is sent
• sent
• was send

it _____ on the phone itself but on a computer.

• was not typed
• was not type
• did not typed
• was not typing

The camera phone _____ in 1997 by Philippe Kahn.

• was invented
• was invent
• invented
• is invented