23. _______ the plane have taken off on time?
--- I’m afraid not. The fog was too thick then.
| A．Would | B．Should | C．Can | D．Must |
________in the heart of Toronto is the Canadian National Tower , which is often called the CN Tower for short.
| A．Locating | B．Located | C．Having been located | D．Having located |
. Emergency line operators must always ________calm and make sure that they get all the information they need to send help.
| A．grow | B．appear | C．become | D．stay |
.Toyota Motor President Akio Toyoda on Monday apologized to Chinese consumers, who ________ the world's biggest auto market, over the company's massive global recall.
| A．make up | B．bring up | C．put down | D．set down |
Not until they left school ______ how much their teachers loved them and helped them.
| A．they realized | B．did they realize |
| C．they would realize | D．had they realized |
Housing price in China is so expensive that it is_______ the reach of those with average income, so the government is taking measures to solve the problem.
| A．over | B．within | C．beyond | D．below |