I. Use the correct form of the word given in each sentences:
1. The telegraph was……………………. in the late 19th century. (invention)
2. The Internet has…………………………. development since 1990s. (increase)
3. Please………………………… to these question before next Sunday. (reponse)
4. The air in this city is very……………………….. (pollute)
5. The next stage in the development of television is…………TV. (interact)
6. UFOs are just the…………………….. of some writes. (imagine)
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