-What do you think of the four classics (名著)of China?-I hear that they are wonderful, but I’ve read _______ of them.
–Look at that girl! Is it Susan? --No, it _______ be her. She went to her hometown just now.
I think it’s_______ useful advice, so I will always remember it.
It’s very in summer. We can in summer.
—What’s your favourite sport? —I like .
—What the weather today? —It’s cold.