More and more carbon dioxide is being released into the air，________the more severe global warming effects.
| A．contributed to | B．to contribute to |
| C．contributing to | D．to be contributed to |
When paying for a taxi, he never looks at his wallet –just takes out one note ____ and hands it over.
| A．by accident | B．on occasion | C．at random | D．on average |
The teacher made____ her duty to care for the lives and study of her students.
| A．one | B．that | C．it | D．this |
The competition between the 2 restaurants was______.
| A．in | B．on | C．away | D．out |
—Excuse me, sir, ________
—I’d like a cup of coffee and two pieces of bread.
| A．what do you want? | B．may I have your order? |
| C．this table is reserved. | D．I would like to serve you. |
When they met ten years later, they talked happily about the people and the things ________ they remembered on the school football team.
| A．who | B．which | C．what | D．that |