选词填空
1.Thank you________your help, Sally. (for / to / four)   
2.Can you put________on his bed? (they / them / their)   
3.Whose cap is this? It's________. (me / my / mine)   
4.Look at your bedroom. Let's tidy________up. (is / it / it's)   
5.This is not________kite. This kite is blue, but________is yellow. ( I )   
6.________socks are those? (Who / Whose / Who's)