Answer:
1) estos 2) Does not make sense at all any one of them, I think it will make more sense if you put eaither Vosotros estais esperando a que comienze el curso, but my guess to that one is <em>estas </em>3)same to the second one and to be hones it will make sense if you write Estos de aqui son mas chiquitos
Explanation:
Sorry if I did not help a lot in this one, but to be honest the 2 and 3 did not make sense.
I showed in the picture below. This answer could vary because there are multiple sums of 84
