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IV- Join both sentences by using the PAST SIMPLE and the PAST PERFECT SIMPLE. AVATAR (a 3D movie) produced by James Cameron. a)Titanic was released in 1997. Cameron started to work on Avatar in 1994. ................before............... b) -The shooting of Avatar was completed in 2008. The producer spent a $237 million budget on the movie. By the time............... c)-Cameron wrote an 80-page script for the movie in 1994. The necessary technology wasn't yet available to achieve his vision of the film. When...............​