1.My sister (finish) school in 2014 and (be) a student at National University since then
=> finished/ has been

2.He often (buy). presents for his daughter on her birthday. Yesterday she (be)her 15 birthday. He (buy) her a big doll. 
=> buys/ was/ bought

3. They spent all morning (learn) this lesson
=> learning

4. She (buy). this house for her son, didn't she?
=> bought

5. She (not live) with her parents.she (live ) alone.
=> doesn't live/ lives

 6. As soon as they (phone)... me, I'll let you know.
=> phone
7.1 (stay). with my parents at the moment though I (have).. my own flat
=> am staying/have

8. Listen! Someone (knock).. at the door
=> is knocking 

9. The Earth (circle)the Sun once every 365 days
=> circles
10. Last night I didn't sleep well. I was very tired. Now I (feel)
=> feel
11. She sometimes (watch).. movies on Sunday.
=> watches
12. Look! Our teacher (come).. She (have)...long hair.
=> is coming/ has

13. The children (like).......... to play in the park.
=> like

14. you ever (be).............. to India 7-Yes, I (be) there three years ago
=> Have you ever been / was

15. They first (meet)..each other last week
=> met

16. What you (do)... last weekend? -1 (go).. to the theater with my family.
=> did you do / went
17 What you (do)..now ? We (play)..computer games
=> are you doing / are playing

18.Maryam (stay) with at the moment She (be).  my sister's friend.
=> is staying/ is
19.The sun always (rise) in the east. Look! It (rise).
=> rises/ is rising

. 20. Where you (spend)..your summer holiday last year, Tam?
=> did you spend

21.In my country, it (not rain). much in winter.
=> doesn't rain

22. The moon (move)...around the earth.
=> moves

23. We often (go)................... to bed early. But yesterday we (go).. to bed very late
=> go/ went

24. When they (finish).. their work? They (finish).. it 2 hours ago
=>do they finish/ finished