I’m afraid we can’t come, but thanks for the invitation_________.

As it was almost time for the flight, all the passengers got ______ the plane.

We’ve published large quantities of books. This year______ we’ve published three million copies.

To understand the grammar of the sentence, you must break it       into parts. 

. --- Believe it or not, I passed the driving test at the first attempt yesterday.--- Great! But remember you can never be ___ careful when driving a car in the street.