Grammar errors

I just don't understand it and I admire why she did it.

He always manages to arrive lately at work although he has recently bought three alarm clocks.

I'm not going to accept this offer that you and the company have made and that's at last.

Your late and this is the sixth time you've been late this week.

They've saved up and gone on a cruise about the world and so they won't be home for at least 3 months.

It was worse of all in the winter as it was usually dark then.

For what seemed ages she read through the situations empty in her local newspaper for a new job.

I awoke up when I heard the sound of the explosion caused by the fire at the oil refinery.

You just can't compare the two houses because it's quite obvious that theirs is very larger than ours.

I'm really boring with all this mail that comes through my door asking me to give money to this or that charity.