The students hurried to the classroom ________ the bell rang.
---Thank you _____ your help! ---________.
I can see ______ oranges, but I can’t see ______ apples.
---Is this computer game _______? ---No, it isn’t. It’s ________.
He likes playing ______ guitar but he doesn’t like playing _____ soccer.
---Is there______ “f” and _______ “u” in the word “four”? ---Yes, there is.