____ is well known to the Irish is ____ St. Patrick was taken to Ireland as a prisoner when he was 16.
| A．It, that | B．As, what | C．That, what | D．What, that |
Have you sent that letter off yet? There’s something important I’d like to add ______ it.
| A．up | B．to | C．/ | D．with |
Living in a house on a mountain top ______ be rather cold, especially in winter.
| A．can | B．shall | C．need | D．should |
_______ a reply from Mabel, Jack sent another e-mail to her.
| A．Not receiving | B．Having not received |
| C．Not received | D．Not having received |
The question under discussion here is ______ of the "white pollution".
| A．that | B．which | C．one | D．it |
I hate _______ when someone calls or knocks at the door while I’m still in bed.
| A．it | B．that | C．them | D．those |