)ex. iv ask the questions using the words in brackets. 1. the new lab has just been opened (where). 2. he has been operating the machine (how long). 3. i find this procedure very helpful (who). 4. they are going to introduce the new system (when). 5. the student gave an example of social factors (why). 6. the sun’s rays will have struck the surface by early morning (what). 7. they have seen the rise of income in the diagram (who). 8. large deposits of coal were discovered in our country last year (when)