.
Tell John not to leave the house unless he________that the lights ______ .
| A．will make sure, turn off | B．makes sure; are turned off |
| C．will make sure; will turn off | D．makes sure; will be turned off |
.After boarding the plane, I found my seat _____ by a police officer, wondering whether I got the wrong flight.
| A．occupied | B．conquered | C．possessed | D．owned |
.If we humans beings continue to waste and destroy natural resources without using _____ energy, such as the energy from the sun, wind and water, our earth will be done for.
| A．alternative | B．solar | C．conventional | D．recycled |
.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 |