Here are the words marked as requested:

1. My parents are at the **airport** at the **moment**.
2. The restaurant was crowded, so we decided to eat **outside** instead.
3. After spending the whole day at the **funfair**, we were tired.
4. We live in an **old** house with a **narrow** garden.
5. Tomorrow, we are going to the park for a picnic with our friends.
6. My sister has long brown hair and a **straight** nose.
7. I am learning about **rainbows** in science class **now**.
8. Let me **show** you how to prepare a simple salad for lunch.
9. Can you **buy** some **pears** and tomatoes from the grocery store?
10. Linda is too **scared** to go on the roller coaster at the amusement park.

**Circle** /aʊ/: outside, funfair, narrow, brown, now, how, buy, pears, scared

**Underline** /əʊ/: airport, moment, old, show

**Double underline** /eə/: prepare, straight, fair