— I want to buy the book ‘The old Man And The sea’. Do you know its_______ ?— Not very clearly, Maybe fifty yuan.
---- Is the physics problem _________? ---- Yes, I can work it out _________.
Don’t worry, Sir. I’m sure I can run _________ to catch up with them.
---- I watched the TV program last night. ---- _________.
----_________ a year does your school have sports meetings? ---- Twice a year.
About _________ people are in the People’s Park at the weekends.