I can’t find my pen. Could you help____________ find it?

If he had a map, he _____ get lost in the mountains.

Can you come on Monday or Tuesday, John?—I’m afraid _______ day is possible. I will be very busy on those two days.

Who’s your best friend? Is ____ a boy or a girl?—A boy. I often play with _____ after school.

Shenzhen is a beautiful city. — Yes. You can see a lot of flowers and trees on ________ of the streets .