1.____________（将领你们去参观我们的新车间）by the secretary.
　　2.You __________（我们期待你能组织贸易推广活动）this time.
　　3.If one or more electrons are removed，__________.（我们就说这个原子带正电荷。）　
　　4.All kinds of measures __________（防止腐蚀）.
　　5. __________（众所周知）natural light is actually made up of many colors.

【责任编辑：青枫】