We can do a lot to stay healthy. __________, we should eat a balanced(平衡的) diet.
--- Why not go to Lao She Tea house tonight? --- ______
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.