Ответ:
1) are; 2) is; 3) is; 4) are; 5) are; 6) is.
Объяснение:
1) Most films (they [plural - мн. ч.]) are made in Hollywood.
2) Jim Carrey (he [singular - ед. ч.]) is known for his comedies.
3) The Cannes Film Festival (it [singular]) is held every May.
4) Changes (they [plural]) to actors' lines are sometimes made at the last minute.
5) Pixar Animation Studios (they [plural]) are based in California, USA.
6) Nomad (it [singular]) is set in 18th centure Kazakhzstan.