The school sports meet, originally to be held last Sunday, was finally _________ because of the bad weather.
| A．called off | B．worn off | C．set off | D．broken off |
---How long has the United Nations ________?
--- ______1945.
| A．come into existence; In | B．been in existence; Since |
| C．been in existence; From | D．come into existence; For |
Dr. Black is a professor of chemistry. _______, he is a famous writer.
| A．In all | B．In brief | C．In fact | D．In addition |
The new invention may __________a lot of changes in our daily life.
| A．result from | B．expose to | C．lead in | D．contribute to |
It _______ them three years to build this road.
| A．spent | B．took | C．spend | D．paid |
I wanted _______ you for your last letter.
| A．thanking | B．to thank | C．thank to | D．being thank |