____ ,I have never seen anyone who is as energetic as Barack Obama.
| A．As long as I have interviewed many leaders |
| B．Since I have interviewed many leaders |
| C．Many leaders although I have interviewed |
| D．Many leaders as I have interviewed |
A lot of research and studies have shown that Trench oil, taken out from kitchen waste,______ the increase of cancers.
| A．appeals to | B．attends to | C．contributes to | D．devotes to |
You are saying that everyone should be equal, and this is ______ I agree.
| A．why | B．where | C．how | D．what |
Only when we saw the photos about the air crash ______ how terrible it was.
| A．we knew | B．we had known | C．did we know | D．had we known |
It rained for two weeks on end, completely ______ our holiday.
| A．to ruin | B．ruin | C．ruined | D．ruining |
My sister, as well as one of her classmates who ______ late for class, _____ criticized by Mr.Hunt.
| A．were; was | B．was ; were | C．was; was | D．were; were |