--What’s this in the blue box? --________is an orange bottle. _______ orange bottle is mine . 

 --- Are these your books?      　　　　　　--- No, they aren’t. They are ____________.

--How do you usually come to school, by bus or by bike?               --       . I walk.

— Who will teach _______ oral English next term? Can it be a new teacher?— Perhaps. But our head teacher hasn't told us ________ .

There’s some litter on the floor. Please ______.