286. In 1920 Poland and Russia were still at _______and they mustn’t trade in agricultural products with each other.

287. The clear colorless liquid that falls as rain, fills lake and rivers, and is necessary for life to exist is______.

288. My eldest sister was left these jewels in my grandmother’s deathbed      .

289. Our victory in the school sports meet resulted from the collective__________of all the classmates.

290. Since reforms and opening to the outside, five special economic _____ have been founded in China. They are Shenzhen, Zhuhai, Shantou, Xiamen and Hainan.

. Jenny liked Fred ____ all the boys he was the most honest one.

. The young man always believes in ____ she says or she does because he loves her so deeply.

. We called the First-Aid Center ____ the traffic accident happened.

. As a teacher, he has never given his students so difficult a problem ____ they can’t work out.

. — Why were you so late for work today?

— ____ to the office was not very easy this morning because of the traffic.