When asked to explain_______ he did to make his students so fasinated with his lessons, the teacher paused and thought deeply．
| A．what was it that | B．that what it was |
| C．what it was that | D．what was it |
Susan made______ clear to me that she wished to make a new life for herself.
| A．that | B．this | C．it | D．her |
Some passers-by witnessed the car accident ______ five passengers were killed.
| A．where | B．which | C．that | D．when |
I tried all I could_____ the topic at the meeting, but he brought it up.
| A．avoided mentioning | B．to avoid mentioning |
| C．avoiding to mention | D．avoiding mentioning |
----The singer together with her band_______ invited to the concert. Did you enjoy that party?
----No, hardly_____ when they sang their top hit Oh, My Baby.
| A．was, I had left | B．were, I have gone |
| C．was, had I left | D．were, did I leave |
Many people can’t learn lessons from the mistakes they’ve made_____they get hurt somehow.
| A．whether | B．unless | C．if | D．as |