-----They used to be good friends, but now they are like strangers. ----- How _____ this ______?
| A．were; come about | B．did; come about |
| C．were; taken place | D．were; happened |
The terrible disease, ______ already kills about one million people each year, has grown resistant ______ standard medicine..
| A．which, to | B．that, to | C．that, against | D．which, against |
_____ well prepared you are, you still need a lot of luck in mountain climbing.
| A．However | B．Whatever | C．No matter | D．Although |
_____ from the fifth floor when the policemen surrounded him.
| A．Jumped down the thief | B．Down the thief jumped |
| C．Down jumped the thief | D．Down did the thief jump |
The boy, _____ parents went to the US last year, felt lonely.
| A．whose | B．which | C．whom | D．that |
Finally, the thief handed everything ____ he had stolen to the police.
| A．which | B．what | C．whatever | D．that |