用所给词的适当形式填空:
（1） _______ (who) comb is this?  It’s ______ (she), I think.
（2）Let ______ (we) go and join _______ (they).
（3）Is that ______ (her) bike? Yes, it’s _____ (her).
（4）This is _____ (I) wallet, not _____ (he).
（5）______ (who) mirror is it? Is it _____ (your)?  
No, it’s not ______ (I). I think it is _____ (she) mirror. It’s _____ (she).
（6）_____ (it) is a cat. And these are ______ (it) food.
（7）Whose socks are those? They’re           (I).
（8）         want to play cards. Do you want to join           ? No, I’m doing          homework. (I)
（9）-Here are many toys. Which one is            (you), Helen?
-The yellow one is          (I), and the red one is          (he).
（10）Let _____  _ ( I ) have a look . Oh, it isn’t          (I) ruler,  I think this ruler is        (he), give it to          (he).