﹣﹣﹣_________do your parents come to visit you in the US, Tom?
﹣﹣﹣Once a year.( )
How often
How long
How soon
How far
--Do you still remember the days ________ we spent in the country?--Yes, of course, they were peaceful and relaxing.
There is no dictionary _______you can find everything.
Three years has passed, but we can’t forget the people _________ helped me a lot in the past.
He is one of the cleverest students ________ hard work was paid in the end.
Great Britain is one of the countries ____ people drive on the left.