20.Helen devoted herself__________to her research and became a top scientist in the field of applied physics.
Man is bornyet everywhere he ischains.
---Do you have trouble finishing the work? ---The work is not so difficult as you think.We have finished it already.
There more than one member whoagainst the plan.
After a knock at the door, the children heard his mother’s voice him.
I am thankful to him for that advice, I owe all my success.