Замените придаточные предложения причастными оборотами.

Model: When we were abroad, we saw different things.
When being abroad, we saw different things.

1. When he was in Moscow, he visited many museums and exhibitions.
2. After he has chosen the theme, he began to write a story.
3. If you are invited to the party, you should come in time.
4. As he was asked, he brought his article.
5. You must have much practice when you are learning to speak a foreign language.