—Do you know_______?—Sorry, I don’t know.A. how old is he B. how old he is C. how old does he
It is she who _________ me with my English every day.
As a student, I can’t afford __________ a new mobile phone.
English is not easy, but I never __________.
Your help made __________ for me to work out this problem.
I don’t think _______ Maths is easy.