—Does he know how to work out the problem ?—Yes , he has a good idea to solve it .
Traffic is bad, ________ in the city center during the rush hours.
To make members of a team perform better, the trainer first of all has to know their and weaknesses.
_____ caused the great damage remains unknown.
Do you still remember the museum _____ we visited three months ago?
_____ breaks the law will be punished.