Identify the seven sentence-skills mistakes in the student paragraph that follow

Identify the seven sentence-skills mistakes in the student paragraph that follows. Choose the letter that describes each mistake. It is this writer's opinion that smokers should quit smoking for the sake of those who are around them. perhaps the most helpless creatures that suffer from being near a smoker is unborn babies, one study suggests that the risk of having an undersized baby is doubled if pregnant women are exposed to cigarette smoke for about two hours a day. Pregnant women should refrain from smoking and to avoid smoke-filled rooms. Spouses of smokers are also in big trouble. They are more likely than spouses of nonsmokers to die of heart disease and to develop fatal cancers. Office workers are a final group that can be harmed by a smoke-filled environment. The U.S. Surgeon General has said “Workers who smoke are a health risk to their coworkers. While one can argue that smokers have the right to hurt themselves, they do not have the right to hurt others. Smokers should abandon their deadly habit for the health of others at home and at work.