Question

Complete::::::::::::::::::::::: *----*

Answer 1

We ''took'' a walk at the park yesterday
Did he ''call'' you again?
Who ''invited'' her to our meeting?
He ''forgot'' to do his homework again

Answer 2

1- We TOOK a walk at the Park yesterday.
2- Did he CALL you again?
3- Who INVITED her to our meeting?
4- How much do you have to PAY for it?
5- He FORGOT to do his homework again.
6- Yes, I REMEMBERED to talk to her about it.
7- What time did you ARRIVE home yesterday?

2- O "Did" já indica passado, então o que poderia completar a oração é apenas um verbo no presente (call).
6- Como não há "did", deve-se colocar o verbo no passado.

Espero ter ajudado ;)