on ground in a sentence

1. Like he's going to be impeached on grounds of infidelity.
2. But it deserved protection on grounds of free speech and academic freedom.
3. Hatteras Light is sitting on ground that wants to move.
4. Lower than the Space Needle elevator stuck on ground level.
5. He retired the next three on ground balls and got 14 overall.
6. It's difficult to find on ground in a sentence.
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