The computer system____ suddenly while he was searching for information on the Internet.
He gave us another piece of advice, ________ of great help to the research work.
Only when _____ in the afternoon _____ able to leave.
Mike was our ________ customer, who used to shop here on Sundays.
Our English teacher loves us very much and he ________.
Mr. Reed made up his mind to devote all he had to _____ some schools for the disabled children.