Due

1.When's it due？  It's due tomorrow.

什么时候截止？ 明天截止。

2.be due to do something

预计什么时候做某事

eg：The next meeting is due to be held in three weeks’ time.

3.What time is the next bus due？

下一趟公交车什么时候来？

4.due date预产期

eg：When is your due date？

5.该付房租了

eg：Our rent is due.

Deadline

1. deal with a deadline 赶着做某事

eg：We are dealing with an impossible deadline.

我们有着难以达成的截止日期。

2.Your mom has a deadline.

你妈妈赶着交稿。

Cutoff

1.miss the cutoff 错过截止时间

My clock didn't alarm，so I missed the cutoff.

Expire

eg：My passport expires next month.

我的护照下个月到期。

I hope it has't expired.

我希望它还没过期。