－I'm afraid that I couldn't pass the examination.－As a student，you need to believe in yourself________you have the ability to achieve any________goal.

 Now I regret ______ those weight-loss pills. 

You were silly __________ your car, otherwise it wouldn’t have been stolen.

---The last one ______ pays the bill.--- Agreed.

．From his ________ voice on the phone I know everything is going under way.