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11. Because people throw rubbish everywhere, the air is polluted.
→ If .
12. Before the tornado came, the villagers had left their houses.
→ After .
13. "I can't log in the Zoom meeting room because the Internet signal is weak", Tuan said.
→ Tuan said .
14. Scientists will create many kinds of robots in the future. (Change into passive voice)
15. Alexander Graham Bell /be/ inventor/ first telephone. (Complete sentence using words)
16. UK /have/ lot/ beautiful place,/ so/ attract/ many/ tourist/ every year. (Complete sentence using words)