—How do you like the popular documentary “A Bite of China”(《舌尖上的中国》)?—Excellent! You won’t realize how wonderful our Chinese food is _____ you watch it.
It’s cold outside. ______ your sweater before you go out.
The teacher did what he could _____ his students.
He works _____ in English, but he can ____ make progress.
Teachers often tell their students _______ across the road when the traffic light is red.
–Lots of trees and flowers ________ on both sides of the road last year. --Oh, _______ beautiful they are!