Ask questions indicated in the brackets. 1. such equipment is sold in special shops, (in what shops? ) 2. these files must be returned in two hours, (when? ) 3. this picture gallery was destroyed by the fire. (how? ) 4. this work can be done in two days, (in how many days? ) 5. the money will be spent on medicine, (on what? ) 6. such questions are often asked by children, (by whom? ) 7. the post will be delivered at 7 o'clock, (when? ) 8. new roses have been planted in her garden, (what? ) 9. the telephone was invented by alexander graham bell, (who? ) 10. rice is grown in many countries, (where? ) 11. this report must be signed by mr. hardy, (who? )