Our math teacher ______ in our school for 20 years and he _____ here when he was 23 years old.
—Which province is the ________ one in winter? —It should be Hainan Province, I think.
—Do you think yesterday’s math problem was difficult? —Yes. I could ________ work it out.
—Is the woman a teacher? —Yes. She teaches ________ English.
This is my beautiful school _______ is near the famous library.
--- Can you tell me ______ on the Internet? --- OK, mum.