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Answer variants:
an object that revolved around the sun that has a tail of gas and dust
things which are not clear
free hour when you don't have work to do
saying something in a low voice
chief academic officer of a college or university
a shelf around a fireplace
1. leisure \(=\)
2. comet \(=\)
3. nebulous \(=\)
4. provost \(=\)
5. whisper \(=\)
6. mantlepiece \(=\)