The U.S. first lady Michelle Obama, arrived in China on March 20, 2014 for _______ six-day visit, focusing on _______ importance of cultural exchanges.
| A．the, an | B．a, an |
| C．a, the | D．the, the |
Columbus __________ America in 1492.
| A．discovered | B．looked for |
| C．invented | D．made |
-Have you visited New York?
-Yes, I have. I __________ there twice.
| A．have gone | B．will go |
| C．have been | D．went |
Our English teacher __________ to England. She'll come back in ten months.
A. have been
B. has been
C have gone
D. has gone
The music made me think of the __________ of a running stream.
| A．sound | B．noise |
| C．voice | D．shout |
Mrs. Green is out. I have to ___________ her baby.
| A．look after | B．look up |
| C．look for | D．look around |