Mary dropped in ____ Mr Smith, but he wasn' t at home, so she went to drop in ____ Mr Smith's office.
| A．on, on | B．at, at | C．on. at | D．at. on |
________ which university to attend, the girl asked her teacher for advice.
| A．Not knowing | B．Knowing not |
| C．Not known | D．Known not |
George returned after the war, only ________ that his wife had left him.
| A．to be told | B．telling |
| C．being told | D．told |
He got up late and hurried to his office, ________ the breakfast untouched.
| A．left | B．to leave |
| C．leaving | D．having left |
I made every effort to get the car out of the mud, but it remained ________ there.
| A．sticking | B．to be stuck |
| C．stuck | D．to have stuck |
—What on earth made Susan weep?
—________ of cheating in the exam.
| A．Be accused |
| B．She was accused |
| C．Because she was accused |
| D．Being accused |