Questions 7 to 9 are based on the following passage. Trumpet is one of the world's oldest instruments. Long ago, people use animal horns or shells as crude trumpets. The point of these instruments wasn't to make music, it was to amplify the voice or make rudimentary sounds. Today's trumpet is really the result of many centuries of development. Although it looks nothing like its ancestors, there are many similarities. All trumpets are hollow tubes. They are all blown. And they all use the player's lips to produce the basic sound. The trumpet developed as players and makers worked to improve its design, size, shape, material and method of construction. They wanted to create an instrument that would produced a beautiful and attractive tone, enable the performer to play all the notes of scale, extend the range higher and lower, make it possible to play more beautiful music, and, in general, be easier to play well. The remarkable way in which the modern trumpet achieves these goals is a measure of the success of all those who struggled to perfect this glorious instrument. The trumpet is actually the leading member of an entire family of related instruments. There are trumpets of several different sizes, and in several different keys. There are cornets, bugles, flugelhorns, and a number of others that are all similar to the trumpet in the way they are made and played. 7. All trumpets share something in common: they are hollow tubes.