The sci-fi movie that we watched last night was absolutely ridiculous. Even though the special effects were incredibly expensive, the story made no logical sense at all!

First blank: English relative clauses don't use an extra "it" (a resumptive pronoun) when the object is already represented by "that" or "which".

Second blank: When a sentence starts with a subordinating conjunction like "Even though" or "Although", we do not use "but" in the second half of the sentence. One conjunction is enough to link the two clauses!