Are you pleased with what he has done? —It couldn’t be ________ . Why didn’t he put more effort into his work?

Jim’s passed the English exam, ______he—I am not sure. Either you or he _____ passed it!

The red-crowned crane is one of _______ in the world.

eBay sells connections，notgoods，______ buyer and seller into contact with each other

e is faced with a dilemma sometimes, he usuallymakes a/an ________ decision by throwing a coin.