When workers are organized in trade unions, employers find it hard to lay them ________.
A、offD
暂无解析
________,Johnhasbeentoseveralforeigncountries.
Whenhesuddenly________upthesubjectofgeneticengineering,therewasanembarrassedsilence.
I'msorryIforgottowrite;Ihadsomuchelse________mymind.
It________asashocktorealizethatIwasnotaloneintheroom.
Theproblem________whenthestudentsrefusedtodotheirhomework.
