If someone has an accident and can no longer walk, scientists might be able to use stem cells to ___ the damaged cells and allow that person to walk again.
The manager said to the employees at the meeting that everyone must___their attention to efficiency
Large quantities of cotton___shipped all over the world already.A large quantity of bamboo___used for pipes to carry water
___houses were knocked down in the earthquake
___in the regulation that you should not tell other people the password of your e-mail account
Most people would agree that nuclear science should be developed to benefit the human beings___harm them