To complete the crossword, we need to use the words in bold from exercise B. Here are the answers:

### Across
2. **Study** - I want you to **study** at the weekend because you've got a test on Monday. (6)
4. **Intelligent** - Another word for 'clever' is **intelligent**. (11)
6. **Subject** - What's your favourite **subject** at school? (7)
8. **Concentrated** - The other students were talking and laughing but Jamie **concentrated** on his work. (12)

### Down
1. **Arithmetic** - If you can do maths problems in your head, then you're good at **arithmetic**. (10)
3. **Mark** - I got a **mark** of nineteen out of twenty in the test. (4)
4. **Look** - I have to **look** for that book because I've no idea where it is. (4)
5. **Paused** - Kelly didn't know what to say so she **paused** before she answered. (6)
7. **Brains** - Everyone uses their **brains** when they think. (5)

### Phrasal Verbs
1. over
2. out
3. up
4. out
5. out
6. up
7. down
8. out

### Prepositional Phrases
1. We learnt that poem by **heart** but I've forgotten it now.
2. Are you in **favour** of teenagers leaving school at the age of sixteen?
3. I thought the exam would be difficult but, in **fact**, it was really easy.
4. Many people, for **instance** my brother, prefer to do something active rather than do homework.
5. In **general**, the teachers at this school are really nice, but some are nicer than others!
6. It's a good idea to start the final paragraph of your composition with the phrase "In **conclusion**."