In communication, a smile is usually strong sign of a friendly and open attitude.
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 _____.
The woman _____ there, _____ in a blue shirt, is Lily’s teacher.