Please excuse me _______ your letter by mistake.
Don't turn off the computer before closing all programs, ________ you could have problems.
I was glad to meet Jenny again, ______ I didn't want to spend all day with her.
(2013·北京卷)Many countries are now setting up national parks animals and plants can be protected.
(2013·大纲卷)When I arrived, Bryan took me to see the house_ I would Be staying.
The children,____ had played the whole day long, were worn out.