Definition: to change to a new religion, belief, etc., or to make someone do this Level: C2
他什么时候改信伊斯兰教？
When did he ___convert to Islam?
弗雷德里卡改信天主教，并一生致力于照顾精神疾病儿童。
Frederica ___converted to Catholicism and devoted her life to mentally ill children.
经过深思熟虑，她决定改信犹太教。
After much reflection, she decided to ___convert to Judaism.
