1. I fear that a prior engagement will p______ me from joining you in dinner.
2. By a strange ______ (巧合) we happened to be travelling on the same train.
3. We must do our best to break down the barriers of ______ (敌意) between the two countries.
4. He ______ (决心) that nothing would hold him back.
5. We are together again after a(n) ______ (分离) of three years.
