___ are very deligent.
| A．Both the girls | B．Both they | C．The both girls | D．They of both |
John began to study French last Sunday. ____________
| A．His brother did so. | B．So did his brother. |
| C．So his brother did. | D．His brother so did. |
Some plants are so difficult to grow that they can only ______ in a perfectly clean environment.
| A．communicate | B．exchange |
| C．survive | D．afford |
The family finally climbed to the top of the Mount Tai, ________.
| A．exhausting | B．amusing |
| C．exhausted | D．fascinating |
Only after he was taken to the teachers’ office did he admit ______ the window.
| A．break | B．breaking |
| C．broken | D．to break |
Her poetry is always easy and __________.
| A．frequent | B．accessible |
| C．partial | D．manual |