Andy isn’t going out this evening, is she—_______. She has to stay at home to look after her sick mother.

We have already placed an order ____that company _____ the machines

下列各句中划线词的解释，正确的一项是（ ）

I will enter a speech competition next week.—___________

Before stamps, people didn’t for the letters they sent,but for the letters they received.