She will never forget her stay there __________ she found her son who had gone missing two years before.
| A．that | B．which | C．where | D．when |
I ______the paper before my lawyer explained the details to me.
| A．signed | B．had signed |
| C．signs | D．has signed |
Having arrived too early for the appointment, Robert decided to read the newspapers ______ time.
| A．to kill | B．killed |
| C．kill | D．to be killed |
______her dark sunglasses, the star wasnt recognized by crazy fans.
| A．Hiding behind | B．To hide behind |
| C．Hide behind | D．Hidden behind |
You ______get this book free if you can tell me the name of the writer.
| A．shall | B．should | C．must | D．need |
Mary won’t keep slim ______she takes exercise every day.
| A．unless | B．if | C．when | D．or |