Concept:A sentence-completion item requires the full sentence to see which word fits grammatically and in meaning.
Explanation:Each option has a different role.
“Loosen” means to make less tight.
“Loose” means not firmly fixed.
“Lost” means unable to be found or past tense of lose.
“Lose” means to fail to keep or misplace something.
No sentence is supplied, so the blank cannot be evaluated.
Therefore, choosing any option would be guesswork.
Answer:Cannot be determined from the information given.