Помогите пожалуйста.
Поставьте глагол в Present Perfect
1. Our son (learn) how to read.
2. Doctors (cure) many deadly diseases.
3. Scientists (split) the atom.
4. You (grow) since the last time I saw you.
5. English (become) one of the most popular courses at the university.
6. My English really (improve) since I took private lessons.
7. I think (see) that movie before.
8. He never (travel) by train.
9. Joan (learn) two foreign languages.
10. you (meet) him? - No, I never (meet) him.
11. you (see) that movie? - I (see) that movie twenty times.
12. I think I (meet) him once before.
13. People (travel) to the moon.
14. you (be) to France? - I (be) to France three times.
15. James (not finish) his homework yet.
16. Bill not (arrive) yet.
17. The rain (not stop).
18. Mary (love) chocolate since she was a little girl.
19. She (be) in England for six months.

1. has learnt2. have cured3. have splited 4. have grown 5. has become 6. has really improved 7. have seen 8. has never traveled 9. has learned 10. have you met 11. have you seen 12. have met13. have travelled 14. have you been 15. has not finished 16. hasn't arrived 17. hasn't stopped 18. has loved 19. has been