The case remained unsolved.
solve would be the root word for the word unsolved. Solved means to find the answer or explanation for; to clear up.
Your question is itself a sentence which uses the word "could".
unsolved
you just used it in a sentence... How do you use mathematical in a sentence? is a sentence
You could write the sentence with the word torrent like this: I don't know how to use the word torrent in a sentence.
A sentence with the word 'grudgingly' in it could be 'i grudgingly shared my sweets with my brother'
sentences with the word mestixo
Give me a sentence using the word Kerchief. That is a sentence that uses the word. Seems as though you could figure this out.
Yeah! A definition sentence, but still a sentence.
A sentence with the word 'blew' could be 'I watched as the kite blew in the wind.'
A sentence with the word idol could be: Justin Bieber is my 'idol', I love his music.
Wow, I can't find a sentence that includes the word desalination in it.