Look! What a clean room! Who _______it ?
-These farmers have been to the United States.-Really? When _______ there?
The weather in Beijing is cooler than _______ in Guangzhou.
-Could you please tell me something about the exchange students?-They are _______,they speak _______.
There is _______ “u” and _______ “h” in the word “hour”.
—Some more milk, please. —Sorry, there’s left in the fridge.