【单选题】Well, Ben not only 8 the rock; he said a lot about it. He named other rocks in its group and even knew 9 the teacher had found it. The teacher and the students were 10 . Ben had learned all this from ...
【单选题】One day, in Ben’s 5 , the teacher held up a rock and asked if anyone knew it. Ben put up his hand and the teacher let him 6 . Why did Ben raise his hand? They wondered. He 7 said anything, what could ...