Конечно же <em>about the cloud</em>, <u>но</u> в зависимости от контекста можно написать и <em>about a cloud. </em><em />
<span>1) She has sailed solo around Britain twice and is planning to sail to Iceland soon.
2) They have flown in a helicopter over New York and say it is an amazing experience.
3) We have driven quad bikes on the highlands in Scotland once and we loved it.</span>
1. Detective catch criminals.
2. Postman deliver letters to people.
3. Scientist learn more about rare plants.
4. Chef cook food for people.
5. Teacher teach English at school.
6. Doctor look after sick people.
7. Engineer design cars.