The great scientist became world-known in the early 1970s,______ he and another scientist made new discoveries about black holes.
288. My eldest sister was left these jewels in my grandmother’s deathbed.
287. The clear colorless liquid that falls as rain, fills lake and rivers, and is necessary for life to exist is______.
286. In 1920 Poland and Russia were still at _______and they mustn’t trade in agricultural products with each other.
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.
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.