You should move back and forth while _______ basketball.
The little baby has a ______ eating nuts because he has no teeth.
Nowadays, people like to discuss if young couples need ______ second child.
—I don’t understand_________.—I’m sorry. But I was doing my homework at that time.
The park is far away from here indeed it’s about_______walk
The world’s population is growing and there is land and water for growing rice.