Complete the sentences. Fill in usually or now / today.

1a. My dad usually comes home at 8 p.m.
1b. It's 8 p.m., but he isn't at home. He's working late now.
2a. My mum usually works from home.
2b. Now she is working in the office.
3a. Usually my mum cooks breakfast.
3b. Now my mum is ill, she's in bed.
4a. I'm listening to an audio book today.
4b. I usually listen to audio books. I love them.