Use the correct verb tense : Past simple or Present perfect :
1. __________ you ___________ all the housework yet ? The floor isn’t very clean now. (do)
2. He _________________ a novel for many years (write), but he _________________ it yet (finish)
3. Mr. Quang ______________ (teach) Math at this school since he _____________ (graduate) in this university in 1989.
4. My brother ______________ my house 10 years ago (leave). I ________________ (never / meet) him again since then.
5. My younger brother _________________ in Chinh Nghia School, but now he is studying in Hong Bang School. (study)
1. Have-done
2. has written, hasn't finished
3. has taught, has been graduated
4. left, have never met
5. studied