Mệnh đề quan hệ 1. According to statistics, how many percent of serious accidents caused by the result of side impacts? 2. What do car makers do to protect occupants? 3. What makes engineers difficult in designing effective side airbags? 4. Why are not occupants always saved by the airbag? 5. What do car makers do to prevent the ineffective work of the airbag?

1 câu trả lời

1.According to statistics, how many percent of serious accidents WHICH WAS CAUSED by ____?

2. What do those whose job is making car do to protect___?

3.What makes engineers difficult in the process of designing effective___?

4. Why are not occupants who are saved by___? 

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