When I got to the office, I to lock the front door

A) was talking / had engaged
7. 7. When Sakura _____ at the theatre, Shannon was
really angry because he _____ for her for more than
an hour.
E) arrived / had been waiting
8. 8. He _____ his boss that he ______back after his
vacation.
C) isn't telling / doesn't come
9. By the time Richard ____ from the army, he _____
involved in three separate riots.
B) retired / had been
10. 10. Scientists _____ that some artificial
photosynthesis______ possible.
E) hope / will be
11. 11. In Asia, for many centuries physicians _____ foot
massage as an aid to the treatment of major health
problems.
A) have used
12. 12. By the time we ____ our preparations for the
congress, most of the participants_____ at the hall.
D) finished / had arrived
13. 13. I ____ Jerusalem Peace Forest so as to escape
from the fear and loathing of the soldiers many times
ever since I _____ to Israel a year ago.
E) have visited / moved
14. 14. The Bastille Prison, where many important
people_____ at one time imprisoned, _____ today
visited by tourists.
A) have been / is
B) had been / have been
C) were / is
D) are / was
E) will be / has been
15. 15. Tony is a wonderful singer; His mother tells me
that he _____ professionally since she was four.