Do you know if Dr White will come for dinner this evening?No, but I think he ______ if he ______busy.
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.
My history teacher said that I ________ do better.