---Who ______ it be that hasn’t handed it in yesterday. ---It _______ be Bob. He handed it in yesterday.
We _____ close friends since we got to know each other in 2006, and we always keep in touch.
I _____ some knowledge of cooking just by watching my mother doing it.
Tom’s mother bought quite a lot of things online but spent only $20 _____.
Either you or I _____ going to attend the meeting in the afternoon.
Students should be encouraged to use _____ Internet as _____ resource.