Don’t swim here ,or you may be __________.
It's________ far_______ walk home from here. Let's take a bus.
They really don’t know how _________ the difficult problem.
They used to be friends, ______?
It has been many years ________ we met at the train station in 2008.
--How can young people realize their dreams?--No matter what difficulties they meet, they can’t ________.