你需要在票价上涨前预订你的航班。

You need to ___book your flight before the fares go up.

他们告诉我最好提前预订一个房间。

They told me that it's better to ___book a room in advance.

我试着预订一张桌子，但餐厅已经订满了。

I tried to ___book a table, but the restaurant was fully booked.