Wind _______ electricity widely in many parts of the world.
| A．is used to produce | B．is used to producing |
| C．used to produce | D．used to producing |
They live on a busy main road. ______ must be very noisy.
| A．There |
| B．It |
| C．That |
| D．They |
They are good friends. _______ is no wonder that they know each other so well.
| A．This |
| B．That |
| C．There |
| D．It |
Does ________ matter if he can’t finish the job on time?
| A．this |
| B．that |
| C．he |
| D．it |
— I don’t know whether I should go abroad or not, Mum.— I leave _______ to your own judgment whether you should do it.
| A．that |
| B．it |
| C．this |
| D．what |
_______ is well known _______ Hong Kong returned to China on July 1st, 1997.
| A．It, that |
| B．As, / |
| C．As, as |
| D．It, which |