The boss____________ the worker how to do it, or the accident couldn't have happened.
I don’t think he is right, ________?
I shall never forget the day __________ Shen Zhou V was launched, _________ has a great effect on my life.
You should go to see him when he is so seriously ill.________, he is your brother.
This story is well worth ____________.
The reason ________ he didn’t come was _______ he was ill.