—Why didn’t you pick up the sunglasses?
—I _____ it, but I didn’t carry that much money.
| A．could buy | B．should buy | C．must have bought | D．could have bought |
We feel _____ our duty to make our country a better place.
| A．it | B．this | C．that | D．one |
He hurried to the booking office only _____ that all the tickets had been sold out.
| A．to find | B．found | C．finding | D．find |
It was so cold that they had the fire _____ all night.
| A．to burn | B．burn | C．burning | D．burned |
If you are _______ about Australian cities, just read the book written by Dr. Johnson.
| A．interested | B．anxious | C．upset | D．curious |
----Where can we get your latest children’s story?
----Soon. It _______ and will come out next week.
| A．has printed | B．is being printed | C．has been printed | D．has been printing |