30. After he had recovered from his injury, he caught a squirrel (松鼠) and raised it as a pet. Soon he ______ home snakes and other creatures from the woods near his school.
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.
______ running,learning English needs will.