If the radio Anderson buys is broken within（），it can be replaced without any charge.

A. seem to be of no use
B. can help people get a better comprehension of the language
C. are easy to master
D. have gone beyond our mother’s reach

A. he murdered one of his classmates with a knife
B. he was not interested in studies and killed his parents
C. he stole something from his fellow pupils
D. he stabbed his teacher through heart with a knife