Who is the tallest boy?–It ______ be John. Because John is of medium height..

I don’t know if he _______here. If he comes, he _______ me.

My little brother likes this kind of pizza. Please give him _______ .

Have you been to the Great Wall? —Perhaps not in my memory. ________, it might have been during my early childhood.

We have to put off the sports meeting _____ the rain. [ ]