Lucy spent three years _______ Chinese before she came to China.
--What do Li Lei’s parents do? --They _________ doctors.
–Did you buy _______ for yourself? --No, I bought ________.
Helen was so careless that she made _______ mistakes in her math exam.
-- ________ do you hear from Karen this year? --Hardly ever.
Tina’s cousin is _______ violinist. He can play _______ violin very well.