____
为了延长种子的寿命、应将种子保存在什么环境( )。
下列各组物质按酸、碱、单质、氧化物顺序排列的是
如果父母误会了我们,正确的做法应该是( )
根据句意及首字母提示完成单词
①He asked p____ to leave the room.
② The government still face very s____ difficulties.
③We p____ £35 for each ticket.
④The country is facing great economic d____.
⑤Peter o____ to teach them water-skiing.