1. 'I'm not sure it's a good idea to play on your phone right now,' his mother said, entering the room. She (GO) up to the window. 'You have a maths test tomorrow, don't you?'

Solution:

The verb 'GO' needs to be in the past continuous tense to describe an action in progress in the past. The subject is 'She', so the past continuous form is 'was going'.

Answer: 1. She was going up to the window.