N.B. Observe carefully the distinction between _cuál_ and _el_, _la_,
_lo cual_, _quien_ and _quién_, _que_ and _qué_, etc.
1. What are you doing? 2. What was your companion doing? 3. Which one?
4. The companion at whom you were looking. 5. "What will you do?" asked
the others, who were much moved. 6. The others, to whom they did not
give time to fire a shot, were giving their guns to the soldiers who had
killed the Poles. 7. Which ones? 8. The ones who had robbed the soldier.
9. Which soldiers stole the portraits that we wore? 10. Which soldier
killed the stranger at whom I was looking?