Every mobile phone has a ringtone(铃声). It tells you that someone is calling you. Now, there  _         a ringtone called “mosquito tone(蚊子铃声)”.
Mosquito tone has a special        . Only children and teenagers can hear it. Using it, students can receive calls and text messages in class           the teacher will not realize what is happening. However, it also has a bad influence on their study if students use it in class.
“Not all the students are             in mosquito tone.” Jerry Jones, a high school student of 17, says, “Using mosquito tone too often is bad for our hearing. I may use it for           , but not in class

A．be B．will be C．is D．was

A．sound B．voice C．noise D．music

A．and B．or C．then D．but

A．interest B．interested C．interests D．interesting

A．pleased B．pleasant C．pleasure D．please