If your knowledge can be in some way ______ with my experience， we are sure to succeed.
| A．joined | B．connected | C．united | D．combined |
It’s surprising that your brother _____ Russian so quickly—he hasn’t lived there very long.
| A．picked up | B．looked up |
| C．put up | D．made up |
According to scientists, our mental abilities begin to ___ from the age of 27 after reaching the highest level at 22.
| A．differ | B．shrink | C．fail | D．decline |
"It's such a nice place," Mother said as she sat at the table______ for customers.
| A．to be reserved | B．having reserved |
| C．reserving | D．reserved |
His writing is so confusing that it’s difficult to make out _______ it is that he is trying to express.
| A．that | B．how | C．what | D．who |
Whatever is left over may be put into the refrigerator, _____ it will keep for two or three weeks.
| A．when | B．which | C．where | D．while |