–Are you going to Shanghai by bus?--I am not sure. It’s cheap, but uncomfortable. I _____ take a train.
—I had a headache. I can’t sleep. —_______
My grandpa is very old and isn’t_______good health.
Julie and her brother went to the_______to buy new shoes.
Be careful, ___________ you will fall off the tree .
______it be Peter? No, it______ be Peter, It ______ be Tom.