Очень Необходимо - put present perfect or past simple.A:Hi Sarah! I

Очень Необходимо - put present perfect or past simple.
A:Hi Sarah! I ........ (not/see) you for a long time. Where..... (you/be)?
B: I .... (go) to China to teach English
A: Wow! How ..... (be) it?
B: Very nice! I ... (stay) in Beijing and .....(teach) eight-years-old children.
A: How .... (you/find) teaching them?
B: Great! The children .... (be) clever and ... (learn) very quickly. What ... (you/be) up to?
A: Nothing as interesting as that! I .... (just/finish) my exams
B: That's good. Do you have any plans for the summer?
A: Yes, I .... (buy) a ticket to Italy. I'm planning to stay with my cousin, Sabrina, for a month.
B: That's great! Sabrina is a lot of fun. I'm sure you'll have a great time. Don't forget to send me a postcard.