用first,then,but,next,because,finally写英语作文跪求~

First - example
"This method has two advantages:first it is cheaper and second it is quicker."
Then - example
"First cook the onions,then add the mushrooms."
But - example
"His mother will not be there,but his father might be."
Because - example
"I did it because he told me to."
Finally - example
"Finally,I would like to thank you all for coming here today."