How long ________they_________? —Sorry, I don’t know. But I know that Mr. Chen is going to _______a nurse next month.
Is that your bike, in front of the black one?-No. It’s ______.
It is _________ difficult work that we can’t finish it in a short time.
Why did they help Mrs Brown with her work? – Because she was _____.
How does he go to Chong Qing? —________________.