“What do you think made Mary so upset?” “_______ her new bike.”
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?
Now Robert, a football fan in our class, ____ rome of his daily allowance given by his parents in order to buy a new football.