Question

He ( to go) to the Public Library ve often when he ( to be) a student.
As soon as I ( to return) from schoo, i (to ring) you up.
You ( to pass) many towns and villages on your own way before you (to arrive) in Moscow.
I ( to stay) at home till she ( to come). Then we ( to go) to the theater if she (to bring) tickets.​

Answer 1

1)goes;is

2)return;I will ring.

3)pass; will arrive.

4)stay;comes;will go; will bring.