-What are you going to do this Sunday? -I ________ yet.
The railway Qinghai to Tibet is the longest plateau (高原) railway in the world.
I find ____ useful _____ English well.
We may meet all kinds of difficulties in the future, but we should be confident enough to any challenge.
— It’s dangerous to walk across the street carelessly.— You’re right. We can’t be careful while crossing the street.
----I think Mr Li is one of ______ in our school.----Me too. He’s friendly and helpful.