— ?— The one behind the tree.
— What do you think of swimming?—It’s not easy, but I won’t ______ I want to be a good swimmer.
_____ you are, _____ mistakes you will make in the exam.
--- By the way, Robert sends his best wishes to you.--- _____.
Thank you for _____ us to your art festival.
There are more and more foreigners coming to China. So I think English is _____useful than before.