—I'm leaving for the doctor's this afternoon.
—OK, but make sure __________ when you leave.
| A．to lock up |
| B．for locking up |
| C．you lock up |
| D．you locked up |
Busy __________ she is, Rita sets aside two hours every Sunday afternoon to spend with her son.
| A．although | B．as | C．while | D．even if |
Mr. Brown arranged for the taxi to come at six __________ he would not have to wait long at the station.
| A．so that | B．even if | C．before | D．because |
__________ this is true in theory, it's very different in practice.
| A．Since | B．Once | C．Unless | D．While |
To everyone's surprise, Michael claimed __________ ail his homework in just one hour.
| A．having finished | B．to have finished |
| C．that finished | D．finishing |
Traditionally, women in China are in red clothes on the wedding day, because red is the __________ of happiness and luck.
| A．logo | B．brand | C．symbol | D．slogan |