— I’m very tired these days because of preparing for exams. — Why not _____ music? It can make you _______. 

 We can’t work out the physics problem. Can you tell us ________?

—________ have you been in this school?—For two years. 

—           do you surf the Internet, Kate?   — Not often, twice a month.

— ___          —I have a headache, doctor.