如果你要来，请提前告诉我。

If you're going to come, please let me know ___in ___advance.

别忘了提前预订，因为夏天假期时大家都离开城市了。

Don't forget to book ___in ___advance because everyone goes away during the summer holiday!

我们需要提前计划会议，以确保一切准备就绪。

We need to plan the meeting ___in ___advance to ensure everything is ready.