Read the sentences and choose the correct explanation for the tense choice

While I was listening to music, my mum was cooking dinner.

• a longer action interrupted by a shorter one
• two simultaneous actions in the past
• an action that happened before another one in the past

You've been typing the message for half an hour.

• an action that began in the past and is still in progress
• an action that happened at a specific point in the past
• a past habit

They visited several museums last week.

• an intention
• background descriptions
• a completed past action

After I had taken up drumming, I decided to start a band.

• two actions completed in the past, with one happening before the other
• past habits
• actions that began in the past and are still in progress

Lily is taking part in a chess competition next week.

• a personal arrangement
• an action happening now
• a fact we are less certain about