— 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 |
15. _______ all the inventions have in common is _____they have succeeded.
A. What; what B. That; that C. What; that D That; what
This old computer must have been of great use to _______ did the scientific research.
| A．those | B．when | C．whoever | D．whomever |
--- Do you know _____ Mr. Black’s address is.
--- He may live at No. 18 or No. 19 of Bridge Street. I'm not sure of _____.
| A．what; which | B．where; which | C．where ; what | D．what; where |
--- Do you know him?
--- Yes, but I can’t remember ________I met him for the first time.
A. where B. what C that D. if
They have not made any decision on ______ they are going to do to deal with the waste and control pollution.
| A．that | B．which | C．if | D．what |