---It is selfless ______ the doctor to devote all the time he had ________ for the patients. ---I think so, they are so great.
---How will you go to the zoo tomorrow? ---If it ______ tomorrow, I’ll go there by car.
While Helen ________ the piano,her mother came in.
The shorts are _________ of all, but they are _________.
The room was dark,_________ I turned on the lights.
----________ have you been studying at school? ----For more than four years.