Mary used to take _______ advantage of the lunch hour to have _______ short sleep in her office.
| A．/; the | B．the; the | C．the; a | D．/; a |
Thousands of people lined up to lay flowers in front of a 28-story high-rise in Shanghai, _______a terrible fire killed at least 58 people.
| A．when | B．where | C．which | D．what |
I don’t know the reason _______ you were absent from the meeting, and I am not sure that someone will tell me the reason _______ you haven’t told me.
| A．why; that | B．that; why | C．because; why | D．of which; that |
She said she was sorry ________ the train, so she had to stay for another day.
| A．missing | B．having missed | C．to miss | D．to have missed |
The actress looked so charming in the beautiful Vera Wang dress that photographers took _______ pictures of her.
| A．a great many | B．mass of | C．the number of | D．a large amount of |
Our maths teacher set so difficult an examination problem ______ none of us worked out.
| A．which | B．that | C．as | D．so that |