Generally speaking, _________ main material for building houses has been concrete, but _________ wood and stone have also been used.
| A．the; / | B．/; / | C．the; the | D．/; the |
It was so bright outdoors that we could see clearly what was happening through the curtains ________ before the window.
| A．hanged | B．hung | C．hanging | D．hang |
—— Hey，what’s up !
—— Excuse me for breaking in, _____ I really have some news for you.
| A．and | B．so | C．but | D．yet |
The last thirty years _________ the quick development in almost every field in China.
| A．saw | B．had seen | C．have seen | D．would see |
A good friend is a person who you can _______ in your hour of need.
| A．turn on | B．turn off | C．turn down | D．turn to |
______ is widely acknowledged that all mankind is created ______.
| A．It, equal | B．It, equally | C．This, equal | D．This, equally |