1/ Millions of pictures are used (Past – were used) to make a one-minute cartoon.
2/ The films script is written (Past- was written) by an unknown scriptwriter.
3/ The special effects are done (Past - were done) in Hollywood.
4/ The main part is played (Past - was played) really well.
5/ The talent of many people is put (Past - was put) into the cartoon-making process.