In the future, more ______ should be placed on the education of the young.

元朝管辖西藏地区事务的机构 ()

网状结构除存在于丘脑，主要位于

在新民主主义社会中存在多种经济成分，其中掌握了国家主要经济命脉的是 ______。

When workers are organized in trade unions, employers find it hard to lay them ________.

研究者发现脑的一定部位的损伤， 往往不是导致某一孤立的心理机能的丧失， 而是引起一系列障碍， 这一现象支持

Senior members of the staff competed eagerly ________ the position of sales manager in the company.

Each year in the United States, many black teenagers _______ of school, either because they cannot keep up or they have to work to support their family.

因受者体内存在针对供者特异性抗原的预存抗体所引起的排斥反应是

在新民主主义社会存在的主要经济成分有 _________。