It is on 1st Sep.( )students go back to school every year.

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• It is on September 1st _____ students go back to school every year.
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• It is on 1st Sep.( )students go back to school every year.
• It is on September 1st _____ students go back to school every year.
• 1.Every morning we discuss business at breakfast(talk about)2.Wendy never fails an exam(always pass)3.Wendy returns to school with her driver(go back)4.The other students often ask me to assist them(help)5.She is still at school (a student)
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• 高数 求切平面方程求曲面x^2+2y^2+3z^2=21上平行于平面x+4y+6z=0的切平面方程.所求切平面与平面x+4y+6z=0有着相同的法向量,所以所求切平面方程为x+4y+6z=21.两平面的法向量相同我能理解,请问详细的思路是什么?可以不用列式子,所求切平面方程为x+4y+6z=正负21