There is ________“s” and ________“f”in the word “useful” .
It’s very kind of you to____ so much time showing me around your school.
You can improve your listening skills _____ watching English movies.
There are more than _____teachers in our school.
─ What do you think of the new film? ─ Oh, much _________.
You have to eat ________ and take more ________ if you want to be _______ .