—I think it’s going to rain.—_____ The sky is dark and cloudy.
I think I was at school, ______I was staying with a friend during the vacation when I heard the news.
There were two boys in the lab, ______did the experiment successfully.
After the new technique was introduced the factory produced cars in 1994 as the year before.
I am in ______charge of the class which was in charge of my wife.
I didn’t like the story, ______ , it’s too long, also it was written by a writer I don’t know