People have planted a great many trees in order to ________ wind and sand in the desert.
| A．hold down | B．hold up | C．hold back | D．hold out |
Playing football and watching TV ________ both interesting.
| A．were | B．was | C．are | D．is |
Either the Greek or the Australian ________ the boxing competition.
| A．have won | B．has won |
| C．are won | D．is won |
Both of you claim you are right.In fact，either you or he ________ wrong.
| A．are | B．is | C．were | D．was |
Either you or one of your students ________ to attend the meeting that is due tomorrow.
| A．are B | B．is | C．have | D．be |
He jumped at the opportunity when he saw the advertisement in a newspaper，because barely ________ make ends meet.
| A．he could | B．could he |
| C．he couldn't | D．couldn't he |