I think________of the materials I listened to at the beginning of the_____easy．

A．two thirds；is                          B．second three；are

B．two thirds；are                         D．two third；are

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.

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

A．three fourths; is                        B．third four; are

C．three fourths; are                       D．three fourth; are

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

A．three fourths; is                        B．third four; are

C．three fourths; are                       D．three fourth; are

— I think ______ of the materials I listened to at the beginning of the exam ______ easy.
— I think so.