1. I'm not sure I believe ( at/ of / in/ to ) astrology. 2. We need to get rid ( at / of / in / to ) large cars to reduce pollution. 3. Some cities are ( at / of / in / to ) danger because sea levels are rising. 4. People must use buses intsead ( at / of / in / to ) cars. 5. The key ( at / of / in / to ) this problem is to study climate change. 6. Who is the leader ( at / of / in / to ) the Green Party ?
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