1. 没= haven't done something. Didn't you close windows before you went out for business?
2. 以后=in the future
3. 马上去开会=go to a meeting right now!
4. 我家的花开了，有红的。 It's short, here's the complete sentence, you may make it out.: 我家的花开了，有很多颜色， 有红色的，也有蓝色的，还有黄色的。Flowers bloomed in my home. Some are red; some are blue and some are yellow. UNDERSTAND?
5. 你有没有什么遗憾的事。 Do you have anything regretful?