The public transport system in Beijing is very good now, so there _____be any difficulty in traveling around the city.
I ______ too much reading.
We hope that she will _____soon.
If we can keep _____ this speed, we'll arrive there in two or three hours.
The Great Wall was built to keep ______ the invaders.
---Those shoes won't_____for mountain-climbing. ---_____this pair be OK?