—________ you tell us a funny story?—Certainly.
—Where is Mr. Zhao?—He _________ to Mount Fanjing. He’ll come back _______ a week.
—Must I water the flowers now?—No, you ________ . You __________ do it later.
We’ll play basketball ________ Class 3 tomorrow.
Do you know _________ an “o” and _________ “u” in the word “computer”?
The Yangzhi River is one of __________ in the world.