l. She..is. attending courses for studying the
English language. 2. He .has.. just made a model aeroplane. 3. They..are.
singing songs now 4. She was playing the piano all the evening yesterday 5.
He has presented his collection to the museum. 6. My friend bought this rare
book at the jumble-sale. 7. The unique collection of ancient books was
presented to him by his father. 8. The books were found by the collectors in
rare-book shops. 9. Books on a particular subject are included in subject
collections. 10. Some books were translated into different languages.