____ the machine, the engineers paid much attention to the noise from it.
| A．Having examined | B．Being examined | C．Examining | D．Examined |
____ the 1990s, the number of antelopes had fallen to about 50,000.
| A．During | B．Since | C．By | D．Over |
If the machine makes a mistake -- ____ rarely happens -- it gives a warning in the form of a red light.
| A．that | B．which | C．as | D．what |
J.K. Rowling, ____ gifted creator of Harry Potter, is ____ success in the literary world.
| A．a; a | B．\; a | C．the; \ | D．the; a |
--- I wonder if I could possibly use your car for tonight?
--- ____. I’m not using it anyhow.
| A．Sure, go ahead. | B．I don’t know | C．Yes, indeed | D．I don’t care |