When did you start to collect stamps?— I got my ______ stamp when I was ______ years old.

Could you tell me ______ yesterday?–I’m sorry, boss, My car was broken on my way here.

_____I bring my ID card with me next time?—No, you needn’t. I have copied and stored it in my computer.

It’s not good for students to play _____ computer games.

_____ your support, we finished the job very quickly.[ ]