I. Choose Participle I or Participle II. 1. We listened to the girls (singing, sung) Russian songs. 2. We listened to the Russian folk songs (singing, sung) by the girls. 3. The girl (washing, washed) the floor is my sister. 4. The floor (washing, washed) by Helen looked very clean. 5. Who is that boy (doing, done) his homework at the table? 6. The house (surrounding, surrounded) by tall trees is very beautiful. 7. Everything (writing, written) here is quite right. 8. Read the (translating, translated) sentences once more. 9. I picked up the pencil (lying, lain) on the floor. 10. Here is the letter (receiving, received) by me yesterday. 11. The (losing, lost) book was found at last