--- Is your husband at home?--- I am not sure. __________ he is in the office.
-- It’s dangerous to walk across the street carelessly.--You’re right. We can’t be ________ careful while crossing the street.
If we don’t study hard, we will in our class.
I don’t know if she ____________ if it _____________ tomorrow.
How much difficulty did you have ________________ this problem?
Nanjing is _______ capital of Jiangsu and it is _______ city with many places of interest.