The Math problem is too difficult , we really don’t know ________ to do it .
--- Which subject do you like better, Chinese or Maths?--- . I prefer English.
--- You did well in English. Could you help me with my English?--- ________.
--- David. Why are you still here? They are ready to start.--- Sorry, but I when to leave.
I hear Mr Brown lives here, but I’m not sure .
Since you are tired, you’ d better and have a good rest.