I think of the material I listened to at the beginning of the exam easy .

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I think ____ of the material I listened to at the beginning of the exam ____ easy .
I think ____ of the material I listened to at the beginning of the exam ____ easy .

I think ____ of the material I listened to at the beginning of the exam ____ easy .
I think "some"of the material i listened to at the beginning of the exam "was" easy.or I think all of the material i listened to at the beginning of the exam were easy.or I think none of the material i listened to at the beginning of the exam was easy．． LOL