---Will you go to Shanghai _______ plane ?---No. It costs too much. We will go there _______ a train.
—What were you doing this time yesterday? —I _______ some cleaning at home.
Though he’s only 8 years old, he can read _______ on science.
—_______ you read the words in English? —No, I can’t. They are too difficult for me.
Most students think Liu Xiang is one of _______ sports stars in China.
—_______ are you going to visit the science museum? —Next Saturday.