My mother’s birthday is coming, I don’t know _________for her．

the fruit-pickers, several of _______were still university students.

I’m sorry I ___ my exercise book at home just now.–Don’t forget_____ it to school tomorrow, please.

He is too old to run_____ to catch up withthe young boy.

Is your father a teacher of English in the No.l Middle School?-No! But he _________ English there for ten years