Is this the only way to reach the city center?

1 . Is this the only way to reach the city center ?
->Isn't.....
2. I have never seen such a mess in my life !
-> Never...
3. I'd made up my mind , but at the last minute I lost my confidence ( Feet )
->...
4 The weather is probably not going to change.( Will )
->.......
6.He  seemed  to be  worried about something(impression)
-->...........
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