51. have faith in sth / be faithful to sth 对……忠诚 52. fall asleep / fall ill / fall silent 入睡/生病/ 恢复寂静 53. sb be familiar with sth / sth be familiar to sb 某人熟悉某物 54. find fault with sb / sb be at fault 挑某人的毛病/ 是某人的错 55...