Complete the sentence with the correct past participle form of the verb in brackets.

2. Morse code (invent) (a)   by an American called Samuel Morse.

Complete the sentence with the correct past participle form of the verb in brackets.

3. The world’s first television images (show) (a)   to scientists in Scotland in 1926.

Complete the sentence with the correct past participle form of the verb in brackets.

4. Radios (use) (a)   to broadcast coded messages during the Second World War.

Complete the sentence with the correct past participle form of the verb in brackets.

5. The World Wide Web (design) (a)   originally to make it easier for nuclear physics researchers to communicate.

Complete the sentence with the correct past participle form of the verb in brackets.

6. Buying books and CDs over the internet (make) (a)   popular by the company Amazon.

Complete the sentence with the correct past participle form of the verb in brackets.

7. The first mobile phones with cameras (sell) (a)   in Japan.

Complete the sentence with the correct past participle form of the verb in brackets.

8. Vinyl albums and tapes (replace) (a)   by CDs, which are now being replaced by mp3 files.

Complete the sentence with the correct past participle form of the verb in brackets.

9. The first English dictionary (write) (a)   by Robert Cawdrey in 1604.

Complete the sentence with the correct past participle form of the verb in brackets.

10. The first mass-produced cars (introduced) (a)   by the Ford company in the USA.