根据句意及汉语提示填空 1. Driving carelessly __________(引起) accidents. 2. It's our __________(职责) to save our earth. 3. They think walking is a good way to relax __________(他们自己). 4. Germs can get into the human body __________(通过) the skin and the mouth. 5. Xu Xiao taught himself on the __________(互联网).