—Who______ it be that is knocking at the door? —It ______ be Father, but I’m not sure.
_______ myself to my study, I would be sitting in a comfortable office now.
Sunset at Mount Huangshan is a beautiful scene, _______ I’ll never forget.
Mike is handsome, kind and full of energy. , I can’t speak too highly of him.
The public transportation in this city is very convenient, where many buses run ______.
—Where have you been all day?—I _______ some former classmates and I couldn’t get back until it was dark.