-Tina ,are you going to play chess on Sunday?-Yes, and I'll also play violin that day.
---How long have you been running ? ---Since ______ .
He said he_____ to my home in a week.
Sally has been swimming ______ four hours.
Sam ______ coins since he was eleven years old, and now he has hundreds of them.
I had a really hard time _____studying science this term.