Has anyone ever told you to "put a sock in it"？That might mean you are too （1）

noisy

noisy

（noise） or you are talking too much.The person wants you to be quiet.It is a funny thing to say.How did this（2）

unusual

unusual

（usual） expression come into being？
We know Thomas Edison （3）

invented

invented

（invent） the light bulb and many other things.He had one favourite invention.It was the phonograph （留聲機(jī)） or "talking machine"，which could record sound and play it back.Edison felt so（4）

excited

excited

（excite） that he called it his "baby".At first，the sound that the machine produced was very loud.And there was no way（5）

to control

to control

（control） the volume （音量） of sound.The sound that came from the horn （喇叭） was so loud that people could hardly talk while the music was played.The noise gave some people headaches. （6）

To turn

To turn

（turn） down the volume，people started putting socks into the horn to make the sound （7）

lower

lower

（low）.Until the 1930s，teenagers always put socks into their record players.It prevented their parents（8）

getting

getting

（get） sick from the loud music.
    （9）

Luckily

Luckily

（luck），a sound control was created.Then socks went back where they belonged-on people's feet.Today，if people tell you to "put a sock in it"，you （10）

will know

will know

（know） exactly what their meaning is.