Hello, Mary! This is John. You must know why I _________ you.－Oh, hello, John! I’ve waited for this call since last month.

______ is too difficult if you put your heart into it.

I don’t know what happened _____ Zhang Hong the day before yesterday. [ ]

What’s this in English? —- It’s_____ orange. _____ orange is his.

_______ the smoke come out of the building, my first thought was to call the fire department as soon as possible.