It was_________ back home after the experiment.
| A．not until midnight did he go | B．until midnight that he didn’t go |
| C．not until midnight that he went | D．until midnight when he didn’t go |
The artist，whose early career was far from being________success，is now widely recognized as________master of painting.
| A．/；a | B．/；the |
| C．a；a | D．a；the |
．We can never expect _________ bluer sky unless we create _________ less polluted world.
| A．a；a | B．a；the |
| C．the；a | D．the；the |
Huangshan is ________ most beautiful tourist site and I want to visit it ________ second time next month.
| A．the；the | B．the；a |
| C．a；a | D．a；the |
He was elected________president of the company，and________news came，in fact，as________surprise.
| A．a；the；/ | B．/；the；a |
| C．a；/；the | D．the；the；a |
Sometimes she talks with Mary over ________ telephone，that is to say，they keep in touch with each other by ________ telephone.
| A．the；/ | B．/；/ |
| C．/；the | D．the；the |