化学、英语作业问题

1.The lack of eye contact probably means the signal of tension.
2.Great Wall made a deep imoression on them.
3.The lecure of Mr.lin last two hours.
4.The manager told his secretary to remind him to attend an important meeting next Monday .
5.To aviod the confusion of communication with colleagues,Mr.wang decided to improve his manner of speaking.
6.Miss yang was considered a good shop assistant,because she said gladly
"hello"拿旦册消宏迟燃 to each customer.
CO2+H2O=H2CO3
CaO+2HCl=CaCl2+H2O

SO3+H2O=H2SO4
CaO+2HCl=CaCl2+H2O