It’s hard to say what kind of person he is. Sometimes he is very nice; at other times he _______ be very cold.
– What makes you so upset, Mr. Wang? – That John, a student in my class, ______ himself to computer games.
Don’t worry too much about ______ mistakes. They are ______ natural part of learning.
I wish you hadn’t given him my telephone number, but you.
You may use the room as you likeyou clean it up afterwards.
—Would you take this along to the office for me? --.