Explanation:

- Namita did not have enough cash. She also did not possess a credit card. This put her in a challenging situation.

- Without immediate means to pay, Namita was in a predicament as she could not settle her bill.

- Luckily, she had a friend she could count on in times of need.

- Her friend came promptly to help her out by paying the bill.

- Namita was thankful for her friend’s timely assistance and wanted to express her appreciation. This is where the word for blank no. 5 comes in.

1. Solitude: Means being alone. It’s not relevant here.

2. Gratitude: Refers to the state of being thankful. It fits perfectly in expressing Namita’s appreciation.

3. Aptitude: Means a natural ability to do something. This isn’t suitable in this context.

4. Attitude: Refers to a settled way of thinking or feeling. Again, not applicable here.