Do come here on Monday, __________we, as planned, will take part in the gathering of AIDS prevention volunteers

David, is this your sister’s bike?— No, it’s not ______. It’s my brother’s.

It is reported that _______ people in the world are suffering from the H1N1 flu.

Is Mary in the library, Tom?－No. She ______ with her friends.

______ is this? Is it a ruler?—Yes, it is a red ruler.