At last our head teacher ______ who broke the window of the classroom.

– You seem to know much about the city.– That’s true. I _______ it four times in the last three years.

—Mom, when can I go out to play football?—Finish your homework first, or I ________let you go out.

---Shanghai is a beautiful city. Do you think so? ---Yes, I _______ there last year and fell in love with it.

As students, we are supposed to spend more time _________ .