pay的過去式怎么寫

　　pay的過去式例句：

　　1. Interest is paid monthly. Three months' notice is required for withdrawals.

　　利息按月支付。提款須提前3個月通知銀行。

　　2. Sandra was determined to become a doctor and her persistence paid off.

　　桑德拉決心成為醫生，她的堅持取得了成功。

　　3. He paid for and was assigned a cabin in first class.

　　他付完錢后被安排到了頭等艙。

　　4. He is cagey about what he was paid for the business.

　　他對自己在這樁買賣中所得的報酬不愿多提。