______in the regulation is that you should not tell other people the password of your e-mail account.
| A．What is required | B．What requires | C．It is required | D．It requires |
Ten giant pandas are heading to the Shanghai Expo, _________ they will go on year-long display.
| A．which | B．where | C．what | D．when |
-- The terrible accident is under investigation.
-- Actually, quicker action ________ those workers trapped in the mine.
| A．might have saved | B．must have saved |
| C．should have saved | D．could have saved |
A strong earthquake struck Chile's central-south coast on February 22, ________ great damage to buildings
| A．caused | B．to cause | C．causing | D．having caused |
China has made efforts to respond to _______ climate change, and set targets to control greenhouse gas emissions by 2020.
| A．/; / | B．/; the | C．the; / | D．the; the |
-- Sorry, I can't return your book today. I am only half way through it.
-- ________. I have plenty of other books to read.
| A．Take it easy | B．No wonder | C．Take your time | D．No doubt |