He was fired ____his carelessness and laziness.
| A．because of | B．because | C．thanks to | D．since |
.Sometimes parents’ control of young kids will be thought to be such an invisible rope with which to tie them tightly that they _____ tried to cut it.
| A．extremely | B．thoroughly | C．desperately | D．obviously |
.Banks accumulated a great deal of knowledge about plants and agriculture. In growing strawberries he went back to the abandoned ______ of spreading straw under the fruit to reduce the necessary amount of watering..
| A．custom | B．approach | C．practice | D．principle |
.While the Internet is creating a global village and bringing people together, we are _____ producing a society where people spend their lives in front of a screen, and become unable to communicate face—to-face.
| A．in the process | B．in progress | C．in danger of | D．in my opinion |
.The possible benefits of cloning are numerous , for______ producing human tissues and organs for transplant, and for preserving endangered animal species to name but two.
| A．artificially | B．materially | C．scientifically | D．medically |
.Don’t make jokes in America. Even in experienced hands, a joke can be a dangerous thing. I came to this ______ recently while passing through Customs and Immigration in Boston..
| A．decision | B．position | C．conclusion | D．illusion |