pay的過去式怎麼寫

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.

他付完錢後被安排到了頭等艙。

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願多提。