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Choose the sentence in which you can omit the pronoun.
1) I read the report that you sent me and it seems to be OK.
2) His job is to buy companies that are about to go bankrupt.
3) We designed an innovative app that will change the way learn.
4) Where is the financial report which I sent you yesterday.
5) He bought a hybrid car, which will help him save on gas.
6) I don’t know which stock I should invest in.
Choose the correct option: