What do you think of the reasons ______ he explained at the meeting ______ reducing the price?

I want to know the owner of the house and ask for information about it.[ ]

Peter, this is our new classmate, Tom. Could you show around the school—Sure, Mr. Green.

He offered to _____ her a hand as the suitcase was too heavy for her to carry.

If _______ bicycle is broken, _______ can use _______.