On hearing the news of the accident in the mine, she _____ pale.

Berners-Lee ________ the idea of the World Wide Web in 1989 while working in Switzerland.

According to scientists, our mental abilities begin to         from the age of 27 after reaching the highest level at 22.

Walking alone in the dark, the boy whistled to       his courage.

---Jack can't concentrate on his study recently．
--- Yes, that might ____ why he did so badly in the last test．

Jenny worked hard before the final examination, and ____．She got an A．
A．took off            B．showed off       C．put off         D．paid off

When designing your house, you'd better ____ land for a garden．

--- How was your family's party?
--- We didn't plan like that, but it ____ very well．

Developing science and technology must ____ people rather than harm them．

Look at the pride on Tom’s face. He _____to have been praised by the manager just now.