1.Someone ______my car and stole the radio.

　　2.Annette ______their engagement only a few weeks before they were due to be married.

　　Engage in

　　3.Several demonstrator ________ the barriers despite warning from the police.

　　4. There are plans to _____ the company______ into several smaller indepanedant companies.

　　broke into, broke off, break through, break up