Choose the right past tense.
1/ They ----- (develop) a new marketing campaign.
2/ The year before, the number of books sold ----- (drop) dramatically.
3/ This man ----- (select) his best friend to replace him.
4/ He ----- (should/ not turn) left here.
5/ They ----- (release) the book a decade ago.
6/ ----- (they/plan) the meeting?
7/ Traffic congestion ----- (worsen) these past years.
8/ When I arrived, they ----- (already/work) for an hour.
9/ ----- (he/can/reach) the airport on time this morning?
10/ Finally, they ----- (not postpone) the appointment.