The lecture,__________ at 7: 00 last night, was followed by an observation of the moon with telescopes.
____is certain is ___prevention is more important than treatment .
Of one thing I am certain _____ hard work contributes to good results.
Being a good listener is a kind of quality and that’s ___ it takes to keep friendship.
Does it make any difference __________ he refuses or accepts the invitation?
---Will you please stop that ? I’m doing my homework. ---I don’t see____it bothers you.