Tim told us that his company ______ robots to do some of the work.
—Is your ipad white, Mandy? —No, it isn’t. _______ is black.
—Do you know _______ man in jeans?—Yes. He’s a professor of _______ university.
--- MH Flight 370 has been lost for nearly three months.--- What a pity! I wonder___________________.
Every morning when the sun ________, plenty of people are watching the _______ of national flag at Tian’anmen Square.
---Monitor, is ________ in the classroom?--- No, Lily is out.