—How long have Mr.and Mrs.Smith________?—For more than twenty years.
The eraser is not mine.It’s__________.
What are the children going to do if it_________ next Saturday?
Hiking is__________ camping.I like both of them.
一I can’t find my pen.Could you lend me ________ ?—Sorry,I’m using it__________.
The child is crying.Please do something to make him__________.