_____ he works hard, I don’t mind when he finishes the experiment

________ everybody is here, let’s begin our meeting.

A ______ has been launched (发起) by the netzens on the Net to ______ unhealthy information which does harm to young students.

What annoyed your father was not what you said，but the way________you said it

________ is known to us all is that Antarctica is the coldest place on Earth