办公室的租金应在每月第一天支付。

Rent for the office space is ___payable on the first day of each month.

到达场馆时可能需要支付一些额外费用。

Some additional fees may be ___payable upon arrival at the venue.

发票上注明全部款项应在30天内付清。

The invoice states that the full amount is ___payable within 30 days.