—Do you know_______?—Sorry, I don’t know.A. how old is he B. how old he is C. how old does he
---My mother isn’t feeling well. ---______.
______ is important for us ______ learn computer.
In this school, ______ students work very hard, ______ they are very happy.
______ good habits ______ very important.
Try ______ more books, and you will find it’s good to read books.