Here are some books for _____ sister and _____.
—Is _____ your backpack?--- No, _____ isn’t. It’s ______ backpack.
---Where are my rulers? ----____________
What color is an orange? It’s ______.
There is _____ “u” and _______ “s” in the word “us”.
Which phonetic transcription(音标) is different(不同的)from the other words?