If metal is heated and then cooled very quickly, , by dipping in cold water, it will be very hard but will break easily.
| A．what’s more | B．in general | C．for example | D．on the other hand |
I felt it a great honour ______ to speak to you.
| A．to ask | B．asking |
| C．to be asked | D．having asked |
“What do you think made Mary so upset?” “_______ her new bike.”
| A．As she lost | B．Lost |
| C．Losing | D．Because of losing |
When you’re learning to drive, _______ a good teacher makes a big difference.
| A．have | B．having |
| C．and have | D．and having |
“How do you deal with the disagreement between the company and the customers?” “The key ______ the problem is to meet the demand ______ by the customers.”
| A．to solving, making | B．to solving, made |
| C．to solve, making | D．to solve, made |
Finding her car stolen, _______.
| A．a policeman was asked to help |
| B．the area was searching thoroughly |
| C．it was looked for everywhere |
| D．she hurried to a policeman for help |