The correct form to complete the sentence would be investigaste.
Hope this helps! :)
<h2>Answer:</h2>
Ellos van a jugar al futbol americano. <em>(They are going to play football)</em>
OR
Ellos van a jugar futbol americano mañana. <em>(Tomorrow they are going to play football)</em>
<u>Note:</u> They are both correct, those are just two different ways it can be said/spelled :)
Explanation:
huh? please explain "No lo creo"
"El misterioso astronauta."
or it could be
"El molestoso astronauta"