After studying mass of data,they drew a conclusion________China is still a developing country.
The situation was very dangerous; the enemies were attacking us _____.
The girl’s sudden death _____ the police’s _____ this matter.
With the crop’s production _____ rapidly, food price is _____ year by year.
We don’t doubt _____ he can do a good job.
On his way to school, he was _____.