You mustn’t lose heart; sooner or later your efforts will ________．
| A．pay off | B．take off | C．give off | D．set off |
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 wasn’t 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 |
____I will go abroad for further study or not is my top concern these days.
| A．If | B．Whether | C．What | D．Where |