The problem is difficult _______.    &nb

_____ is the most difficult of _____. [   &nb The teacher asked the students _______.   &nb The sweater is _______ of wool. [     ] The film Kung Fu Panda  is _    &nb ( ) ( )  3       &nb        A         &nb The canteen is _____________ the first floor. [&nb The most important thing is _______. [   &nbs 听对话，选择正确答案。（听两遍） 1.The eraser is     &nb If x is a prime number，y is&nb difficult  They are thinking about _______ the poor children.  &nb