There _____a book and two pencils on the desk.

Do you know when Britain _______ war on Germany during the Second World War?— In 1993, I suppose. [ ]

What troubled the teacher was that no one present made an answer when asked who had broken the glasses, so he didn’t know who .

We must help each other and _____ each other.

Mary told me to wait for her at the school gate, but she didn’t appear at all.