. --- I think the waiter has forgotten us. We ________ here for over half an hour! --- I think you’re right. He probably thinks we have already ordered.
---Will you go to the Great Wall with us? ---If John wants to go, ____.
The old man ___ all his money.
This is the museum ___ we visit yesterday.
The president of the university has been ___ for two years.
I can ___ believe that it was raining.