.Operation rooms should be kept free ______ bacteria of any kind.
| A．with | B．for | C．from | D．to |
Last Sunday，we took ________ guided walk around by ________ signs of the famous town.
| A．the；the | B．a；/ |
| C．the；/ | D．a；the |
________ China's growth is not ________ threat to others.On ________ contrary, it will bring more opportunities to the world.
| A．The；a；/ | B．The；/；the | C．/；a；/ | D．/；a；the |
Obama has been elected ________ first black President of the United States, and the international society expects to have ________ new USA under his leadership.
| A．/；the | B．a；the | C．the；a | D．the；the |
The biggest whale is ________ blue whale，which grows to be about 29 meters long—the height of ________ 9－story building.
| A．the；the | B．a；a | C．a；the | D．the；a |
What I need is ______ book that contains ________ ABC of oil painting.
| A．a；/ | B．the；/ | C．the；an | D．a；the |