Since nobody gave him any help, he __________ have done the research on his own.
| A．can |
| B．must |
| C．would |
| D．need |
286. In 1920 Poland and Russia were still at _______and they mustn’t trade in agricultural products with each other.
| A．battle | B．campaign | C．struggle | D．War |
285. In the hotel semi-skilled workers include chambermaids (客房女服务员) and______ or waitress, who must have training for their particular duties.
| A．assistants | B．waiters | C．guards | D．Cooks |
284. The officers led their men to _______ in battle, so all the villagers came out to award them with food and drink on both sides of the road.
| A．victory | B．a triumph | C．failure | D．Defeat |
283. The house was sold for 60,000 dollars, which was far more than its real _______ .
| A．cost | B．value | C．price | D．Worth |
282. Our earth, one planet of the solar system, is only a very small part of the__________.
| A．universal | B．university | C．universe | D．Union |