Fill in each of the numbered blanks with One suitable word to complete the following pasages:
People have smoked cigarettes for a long time now.The tobacco which is(1)...to make cigarettes was first grown in what is now part of the United States.Christopher Columbus,(2)...discovered American,saw the Indians smoking.Soon the dried leaves were transported to Europe where smoking began to catch on.In(3)...late 1800s,the Turks made cigarettes popular.
Cigarettes smoke contains at(4)...two harmful substances,tar and nicotine.Tar,which form as the tobacco burns,damages,the lungs and(5)...affects breathing.Nicotine,which is found in the leaves,cause the heard to(6)...faster and increases the breathing rate.
Smoking(7)...is dangerous.The US Publuc Health Service ed that cigarettes smoking is the cause of lung(8)...and several other deadly(9)...The US government now requires that each package of cigarettes bears a special warning about the(10)...of smoking.