So suddenly that the animals in the zoo looked very frightened during the total solar eclipse.
| A．did the sky turn dark | B．the sky did turn dark |
| C．turned the sky dark | D．was the sky turned dark |
O'Neal works hard. He is often seen _______ heavily before his teammates have even arrived at practice.
| A．sweated | B．to be sweated |
| C．sweating | D．being sweated |
"Who Moved My Cheese?", ____________ is a best-selling book, is written by Spencer Johnson.
| A．which | B．that | C．it | D．what |
—I'd like to have some lunch but I have to stay here doing my work.
—___________ what you want and I can get it for you.
| A．To tell me | B．Telling me |
| C．If you tell me | D．Tell me |
—Why! Where's my passport? Maybe I left it on the plane.
--My Goodness! You ____________ things behind.
| A．had never left | B．didn't leave |
| C．never left | D．haven’t left |
When I tried to find _________that prevented so many people from taking part in the program, it seemed to me that there were two main reasons.
| A．why it did | B．that it did | C．what it was | D．why it was |