My mom always tells me that _________/'nʌθɪŋ/ is difficult.

— What’s your telephone number? 　　     — ________ 321471. 

— Alice, is this you dictionary?— Oh，no, it’s not _______.  Ask Tom. He is looking for ____.

— Look, here’s an English book on the desk, Is it yours?— No, it isn’t _______. It must belong to _______.

——Look! Who is the man in the picture（图片）?——I know.  ______ Zhou Xingchi.