Sure, here are the answers to the questions:

11. Alex tells me that he wants to be a lawyer when he.....
- D. grows up

12. Jennifer prefers making pottery…..collecting stamps.
- A. than

13. I watched a film about Australia and I…..it really interesting.
- D. found

14. ”…..festivals are there in your city in February?” – “I'm not so sure”.
- D. How many

15. I'll get up early tomorrow…..I can be at the stadium in time.
- B. so

16. Tokyo is one of…..cities in the world. You'll have to spend a lot on accommodation there.
- C. the most expensive

17. My brother…..cycling in the park in the morning.
- C. often doesn't go

18. So far Nick…..more than 500 stamps from many countries in the world.
- C. has collected

19. My sister spends half an hour every day…..the flowers in the garden.
- B. watering

20. Mike:…..our classmate's performance tonight?” - Jim: “It's marvellous!”
- C. How do you think