As we know, water is very important _______ us.A. of B. to C. on
—Is Alice your sister?—________. My sister is Helen.
—Here ________ two pens for you, Alan.—Thanks.
—Are these girls your sisters?—No, ________ aren’t.
Jack is my uncle. His daughter is my ________.
—This is a photo ________ my aunt.—It is nice.