4 ...................................................... computer?

Past Simple

1. What did Becky do on the computer?

Explanation: This 'What' question in the past simple asks about an activity performed on the computer. The to-do list includes 'work on computer' with a cross, suggesting she might have planned to but didn't, or the question is phrased differently. However, the most logical completion based on the provided text and typical question structures would relate to an action on the computer.