Only after _______ did people know it was not an accident, but an attack of some kind.
| A．the second tower of the World Trade Centre was hit |
| B．did the second tower of the World Trade Centre fall |
| C．was the second tower of the World Trade Centre hit |
| D．the second tower of the World Trade Centre was fallen |
Try to read stories in English and speak in English whenever you can，________ you will see more progress over time.
| A．but | B．or | C．and | D．so |
Stand over there ________ you'll be able to see the oil painting better.
| A．but | B．till | C．and | D．or |
He found it increasingly difficult to read，________ his eyesight was beginning to fail.
| A．though | B．for | C．but | D．so |
John plays basketball well，________ his favorite is badminton.
| A．so | B．or | C．yet | D．for |
In some places women are expected to earn money ________ men work at home and raise their children.
| A．but | B．while | C．because | D．though |