We all should be carful when we( )on the strrt.A.to walk B.walking C.is walking D .are walking

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• We all should be carful when we( )on the strrt.A.to walk B.walking C.is walking D.are walking
• We all should be carful when we( )on the strrt.A.to walk B.walking C.is walking D .are walking
• We all should be carful when we( )on the strrt.A.to walk B.walking C.is walking D.are walking
• We all should be carful when we( )on the strrt.A.to walk B.walking C.is walking D .are walking
• When we got to the stop,the last bus had gone,so we had no choice but __home.A.walk B.walking C.to walk D.to walking
• 请详解一下胡克定律,
• 平面内两条直线相交有1个交点,两平面相交形成几条直线.