Not until all the fish died in the river, _______ how serious the pollution is.[ ]

eens are smoking in Beijing, ______ the number of primary and middle school students picking up the habit has more than doubled from previous years.

Jack said he would have to stay up late to prepare for his geography project tonight.— But he Mr Zhao said we could hand it in next week.

依次填入下列各句横线处的词语，最恰当的一项是（ ） ①有这么一个规律，在所有第三世界发展国家中，工业和农业是互相________、互相支援的两大国民经济部门。②你别看他穿得挺邋遢的，和他交往久了，你就会发现其实他是个蛮有_______的人。③过年了，孩子们都非常喜欢到“七大姑、八大姨”什么的家里去________，真是快乐得很。

I am going to Shanghai for a holiday. —- _________ .