Don’t all speak at once! _______ please.
| A．One by one time | B．One for each time | C．Each at one time | D．One at a time |
These professors had interrupted their own research to accept an invitation to _______in an unusual experiment .
| A．take a part | B．take part | C．play a part | D．play part |
I really don’t know why he hates everything we _______.
| A．stand out | B．stand for | C．stand aside | D．stand up |
---Good news .Jack ,I’ve got promoted .
----You _____it .Your abilities and hard work paid .
| A．get | B．mean | C．make | D．deserve |
I bought a dress for only 10 dollars in a sale ;it was a real _______.
| A．exchange | B．bargain | C．trade | D．business |
—I wonder how much you _______for your servives.
---Well ,the first two are free while the third costs $30 .
| A．bargain | B．charge | C．offer | D．donate |