读下表，你认为LED灯比白炽灯、节能灯贵的根本原因是（ ）
The fact __________he didn’t see Lao Li yesterday is true.
The problem is__________he has enough time.
__________ the sports meet will be held depends on the weather.
__________he said at the meeting astonished everybody present.
It was a matter of__________would take the position.
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