Snowden arrived at Sheremetyevo International airport on June 23, _____ he was prevented from leaving for six weeks after the U.S. canceled his passport.
| A．which | B．where | C．when | D．what |
To make members of a team perform better, the trainer first of all has to know their .
| A．strengths | B．benefits | C．techniques | D．values |
.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 |