Here are the verbs filled in according to the correct tense:

1. Mary **had** a bath yesterday evening. I was in the kitchen.
I **cooked** her favourite dish because I **wanted** to surprise her.
When she **came** into the kitchen, she couldn’t believe her eyes!

2. Jim: Mum, I **have been looking** for my black belt the past hour and I **did not find** it. **Have you seen** it anywhere?
Mother: No, but I think you **lent** it to your brother about a week ago.
Jim: Oh, you’re right. He **has not given** it back to me. I bet he **is wearing** it all week. Where is he now, Mum?
Mother: I’m afraid Mark **left**.
He **got** up about an hour before you **did**.

3. I **was working** on this project this morning but I **have not finished** it. What am I going to tell my boss?