What _______useful book it is!—Yeah, it tells you how to play _____ guitar.

The government of Yancheng is building_________cheap and good houses for the people.

We knock _____people’s doors, and they usually give us some candy ______ a treat.[ ]

Though Lei Feng ________ for fifty years, we are still learning from his spirit.

About ________ of the workers in the factory were born in the ________.