Answer:
1. Would you mind **opening** the window, please?
2. John **rang** last night.
3. What were you doing when I **rang** yesterday?
4. This is the **most expensive** jacket I've ever bought. It cost a **lot**.
5. **Is there a little** sugar in your tea?
6. Jon has offered **to help** me with my homework.
7. This film is **better** than the one we saw last week.
8. Have you **tried** the food in the new cafe in town yet?
9. **Have you been studying** French for three years now?
For the second sentence:
1. Can you tell me **whether** you're coming at the weekend?
2. Jackie **spoke angrily** to me yesterday.
3. From what you've said, **Jumpers seems** like a really funny film.
4. The singers **were brilliant** on the TV show last night.
5. Tim **works the hardest** of all the students in our class.
6. I'd **rather go swimming** than watch TV.
7. John **wasn't careful enough** on his bike, so he fell off.
8. You really need to take more care! **Be more careful!**
9. **Thanks for helping** me.