Jack wasn’t saying anything, but the teacher smiled at him _______he had done something very clever.
What a _____ boy! I don’t know what to do with him.
The dog didn’t seem to smell _____, for it didn’t even smell the meat, which appeared so _____.
-- What caused the failure of the experiment? -- _____.
A cracked bell can never sound _____.
We might not contact the rescue team. _____, the rescue team itself might get lost.