---You’ve dropped _____ “s” in the word “acros”---Oh, ____ letter “s” should be doubled like this “across”.
My uncle has taught in this school he was twenty years old.
一have you been in the sports club? —Since the first month I came to the school.
—Have you finished your homework? —Yes . I it just now.
The workers have worked for ten hours. They want to stop a rest.
When he arrives at the bus stop, the bus for 20 minutes.