某物质出入细胞的方式是从浓度低的一侧通过细胞膜向浓度高的一侧转运，同时需要消耗 、需要有载体的协助，这种物质出入细胞的方式叫 。
His letter was so confusing that I could hardly make any ______ of it.
She had prepared carefully for her English examination so that she could be sure of passing it on her first ________.
—Hi, this way, please. —OK.I sometimes have no sense of ______ when I arrive at the crossroad.
The rain yesterday was heavy._____, the road were flooded.
Some people either _____ avoid questions of right and wrong or remain neutral about them.
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