Answer the following questions using the clues in brackets :
Example: How long have you lived here? (since I was born)
I have lived in Bucharest since I was born.
1. Have you seen this movie? (several times)
2. Has your brother come back home? (not yet)
3.
Have you done your homework? (yes, already)
4. Have the scientists discovered the cause of the disaster? (not yet)
5. How long has your brother studied Art? (for five years)
6. Have you seen our neighbour today? (twice so far)
7. How long have you known Jack? (since I moved to this town)
8. Do you think I have changed? (a lot /since we last met)
9. How many times have you been to Germany? (never)
10. How many letters have you sent him? (ten so far)