Помогите Fill the gaps with the correct tense (Past Simple or

Помогите Fill the gaps with the correct tense (Past Simple or Present Perfect).

1. It
snowing for a while, but now its snowing again. (stop)

2. The city is very different now. It
a lot. (change)

3. I did French at school, but I
most of it now. (forget)

4. The police
three people, but later they let them go. (arrest)

5. What do you think of my English? Do you think it
? (improve)