No one asked for me while I was out, ___?
| A．didn't he | B．did they | C．did it | D．do they |
Over one thousand passengers remained_____ on trains for hours without air conditioning because of power failure on the railway,
| A．sticking | B．to be stuck | C．stuck | D．having stuck |
In order to help the police, the eyewitness described what he had seen very carefully not to______ any key clues.
| A．cut off | B．leave off | C．squeeze out | D．leave out |
Diaoyu Island issue, unless ________ properly, will directly affect smooth development of relationships between China and Japan.
| A．handling | B．having handled | C．handle | D．handled |
Netizens are frequently reminded to be ________ about revealing (透露) their personal information on the Internet.
| A．strict | B．severe | C．cautious | D．positive |
We must apply what we have learned to our daily work because in no case _____ from practice.
| A．should theory separate | B．should theory be separated |
| C．theory should separate | D．theory should be separated |