He was busy writing a story, only once in a while to smoke a cigarette.
| A．to stop | B．stopping | C．to have stopped | D．having stopped |
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 abroadornot, 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 |
The Parkers bought a new house but ______ will need a lot of work before they can move in.
| A．they | B．it |
| C．one | D．which |