The computer system ________ suddenly while he was searching for information on the Internet . [ ]

Your shoes are so old. Why don’t you buy a new pair—Because I ______ all my money on an MP5.

Help ____ to the chicken, Tom and Jim.—Thank you.

It was with great joy _______ he worked out theproblem that he had long been puzzled about

Mr Ma is the person _____ we learned how to write with brushes.