The teacher wants to know _____ her son is good at maths or not.A. if B. that C. whether
—Whose (谁的) hat is this? —I think it's _______.
---Are there any ________ on the farm? ---Yes, there are some。
---What are________ teachers doing?---They are having a meeting.
Here ______ two photos of my family.
Here is a photo ______ your family.