Раскройте скобки употребляя Past Indefinite или Past Continuous ,Present Indefinite или...

Question

Раскройте скобки употребляя Past Indefinite или Past Continuous ,Present Indefinite или Present Continuous
1. What you (to do) while I (to write) the letter yesterday? 2. Where is
Steve? He (to prepare) for the new trial in the next room. 3. I (not to
understand) what Mr. Green (to do). 4. Something (to smell) good. Are you
making pancakes? 5. Look at the timetable. I think I (to hear) the bus. 6.
Charles (to look) just like his father. 7. The secretary (to come) in and (to say) that
a visitor (to wait) for me in the hall. 8. What you (to do) between 9.00 and
10.00 yesterday? — ( to ask) the detective.

Answer 1

What  were you doing while I was writing  the letter yesterday? 2. Where is
Steve? He is preparing for the new trial in the next room. 3. I do not 
understand what Mr. Green is   doing. 4. Something smells good. Are you
making pancakes? 5. Look at the timetable. I think I  hear the bus. 6.
Charles  looks just like his father. 7. The secretary  came in and  said that 
a visitor was  waiting for me in the hall. 8. What were you  doing between 9.00 and 
10.00 yesterday? — asked the detective.