Here is ______ e-mail from my friend.

Mum, this is ________ teacher. ________ name is Li Hui.

Hi, Bruce! I haven’t seen you for such a long time. It _______ that you’ve changed a lot.–Yes, time flies!

There are ________ people in the supermarket. It’s so crowded.

What do you call this in English?—It’s a stamp. It is used ______ sending. [ ]