Supply the correct verb form: Past simple or Present Perfect

Exercise 4:Supply the correct verb form: Past simple or Present Perfect
1. My brother (join) ____________ the army when he (be) young
2. Mr. Jackson (paint) ____________ his house since last month
3. Columbus (discover) ____________ America more than 400 years ago
4. We (study) ____________ French for five years at school but we (not learn) ____________
very much
5. A: ____________ You (teach) ____________ English before?
B: Yes, I (have) ____________. I (teach) ____________ English for three years in Hong
Kong and when I (come) ____________ back, I (start) ____________ teaching at the
Kensington school of English and I (teach) ____________ there since then
6. A: I (see) ____________ Jack last night
B: Oh really? I (not see) ____________ him for three months. How is he?
7. A: you (ever/win) ____________ a competition?
B: Yes, I (win) ____________ a photographic competition in 2001