I just don’t understand ________ that prevents so many children at school from being as happy as one might expect.
| A．what it is | B．what it does |
| C．what is it | D．why is it |
Parents are taught to understand ________ important education is to their children’s future.
| A．that | B．how | C．such | D．So |
I have always been honest and straightforward , and it doesn't matter_______I'm talking to.
| A．Who is it | B．who it is | C．it is who | D．it is whom |
Along with the letter was his promise ________ he would visit me this coming Christmas.
| A．which | B．that | C．what | D．whether |
The other day, my brother drove his car down the street at ________ I thought was a dangerous speed.
| A．as | B．which | C．what | D．That |
A story goes ______ Elizabeth I of England liked nothing more than being surrounded by clever and qualified noblemen at court.
| A．when | B．where | C．what | D．that |