Ex.1
1. C already
2. C just
3. A yet
4. B haven't
5. A checked
6. C yet
7. B 've just
Ex.2
2. Marissa and Ian have just got engaged.
3. They still haven't found their keys.
4. Mum has already met my new boyfriend.
5. Natalie still hasn't performed with an orchestra.
6. Have you gone out with Gabriel yet?
7. Hannah's parents have just got divorced.
8. I have already gone on two dates with Lisa.
9. Has Jake done his homework yet?
10. Sam and Joanne still haven't got back together.