Tom, clean up the broken glass _________ someone walks on it.
________ H7N9 is a deadly virus, it is still safe to eat thoroughlycooked chicken.
I will accept Guy coming with us, ________ he pays for his own meals.
Scientists are warning that ________ emissions of carbon (碳排放) are cut, we could be heading for an environmental disaster.
——Did you inform Helen of the plan put forward at the meeting?—Of course. ________ I saw her.
Please call my secretary to arrange a meeting this afternoon, or ________ it is convenient to you.