--Do you know the cost of buying a house in Shanghai is much higher than __ in Tibet? ---Of course, I know. It’s impossible for me to buy_____ there.
It ________ over ten years since the dog ____________.
--- Have you finished your work _______? ---Yes, I've _______ finished it.
great fun it is to fly in a balloon!
—It’s too hot. Would you mind _______ the door? —_______, please do it now.
It was exciting to see so many elephants__________.