Talking in a very low voice is （）. A: whistling B: hushing C: whispering D: grumbling

I wish you’d stop chatting on about things you don’t understand. A: singing B: shouting C: talking idly D: whistling

If you say that a situation lasted for a/an , you mean that it seemed to last an extremely long time, usually because it was boring or unpleasant. A: whistling B: eternity C: while D: emotion

Which of the following statements about communication by hearing is true（） A: Communication by hearing is more important than communication by sight. B: Whistling and applauding are the only two forms of communication by hearing. C: Handshaking, as well as hand-stroking, has enabled the blind to communicate by hearing. D: It is possible to communicate intelligently by hearing.