Use given words to rewrite the second sentence that the meaning not change

Part 1. Use given words to rewrite the second sentence that the meaning not change (1 point)
1. Keeping the environment clean is very important.
→ It’s    
2. They will show the time machine to the public when they finish it. 
→ The time machine    
3. It’s three years since I last spoke to her.
→ I haven’t    
4. “Please turn down the radio for me”, said my father.
→ My father asked    
5. You are not allowed to smoke here.
→ Would you mind    ?