fourths
                    - _______ of the materials I listened to at the beginning of the exam _______ easy.
 - I think ____ of the materials I listened to at the beginning of the exam ____ easy.
 - .I think _________ of the materials I listened to at the beginning of the exam ____ easy.
 - Nearly _______of the earth___covered by sea.
 - _______of the money_______been spent recycling the rubbish.
 - _______ of the materials I listened to at the beginning of the exam _______ easy.
 - I think ____ of the materials I listened to at the beginning of the exam ____ easy.
 - .I think _________ of the materials I listened to at the beginning of the exam ____ easy.
 - Nearly _______of the earth___covered by sea.
 - _______of the money_______been spent recycling the rubbish.