[1] Safety in the highway is not totally out of hand. Here are four ways you can protect y

[1] Safety in the highway is not totally out of hand. Here are four ways you can protect yourselves when you travel.
[2] You are safer in a large car. People in small cars are injured more often and more severely than people traveling in large cars. Factories of small cars are strengthening their products’ safety, which helps. But the mix of large cars and small cars on the road is the main reason for the safety problem.
[3] Being thrown into glass and metal parts of a car — or being thrown from the car — can really damage you. That’s why safety belts should be worn. The safety belt’s main purpose is to pull you back. If your car has a sudden crash with another vehicle or object or if it rolls over, a belt can reduce the chance of fatal injury by 45% and the chance of serious injury by 50%.
[4]     . More than half of all new cars sold have air bags. Air bags provide protection in frontal crashes — the type of crash that kills the most drivers, though they are also wearing safety belts. Most people demand air bags in the cars they buy. But the protection provided by air bags is limited in side or rear crashes; effective as they are, they can’t take the place of safety belts.
[5] Drunk driving crashes are less likely to happen if you don’t drink. Drunk driving is the most serious problem. Many people have realized that mixing drinking and driving can lead to death and injury, prison time and other results. There are measures to strengthen penalties (处罚) for drinking and driving.
【小题1】What is the main idea of the passage? (no more than 10 words)
        
【小题2】Which sentence in the passage is the closest in meaning to the following one?                   Air bags can not do much protection in side or rear crashes; although they are effective, you can’t replace safety belts with air bags. 
    
【小题3】Fill in the blank in Paragraph 4 with a proper sentence. (no more than 5 words)    
                                                                               
【小题4】What does the underlined word “they” in Paragraph 4 refer to? (no more than 2 words)
    
【小题5】Which of the suggestions do you think is the best for you? And why? (no more than 30 words)
    How to protect yourself when you travel.