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There are so (much改成many) road accidents every day.They are often caused by carelessness.(But改成So) there are many rules that help to make the road (safety改成safe).Here are some rules (what改成that 或 去掉 what) we ought to know:In Hong Kong traffic keeps to the left.Before (across改成crossing) the road,we must stop (or改成and) look at both sides.Look right; look left and look right again.If (加入the) road is clear,it is safe (加入to) cross the road.If we (saw改成see) small children or very old persons,or blind people (waited改成waiting) to cross the road,we can help them to cross the road safely.