—Is the blue ruler _______? —No. _______ ruler is red.

 When you get on a bus, it’s polite to wait for ________ turn. 

---_____ of them knows Japanese, so I have to ask a third person for help.---You’d better ask Tom for help. He is good at Japanese.

We must protect plants. They are friends of ______.

“______ do you like? The yellow one ______ the white one?” “The yellow one.”