Since you are in a public place, the noise of your radio must be ______ to a level that we all feel comfortable with.

_____ it was very cold, _____ my friend still went swimming in Jialing River this morning.

_______ jeans were invented over 100 years ago, theyre still in fashion today.

All ______ the world, most of people can speak English and Chinese.

Lily, my partner, is usually friendly to others, but she___ get into bad temper sometimes.