The athlete’s years of hard working _______ when she finally won the Olympic gold medal.
| A．went on | B．got over |
| C．paid off | D．ended up |
The text is too difficult. The explanation of our teacher will help make it easy ________.
| A．to understand | B．to be understood |
| C．understood | D．understanding |
It is said that sixty percent of all energy ________ in the world today is being lost as waste heat.
| A．produced | B．producing |
| C．to produce | D．having produced |
________ clearly ________ nothing to do, the soldiers left the village the next day.
| A．It; was | B．It; being |
| C．There; was | D．There; being |
—I regret ________ you that your application has not been successful.
—Not successful? I performed pretty well in my interview!
| A．informing | B．to inform |
| C．having informed | D．to have informed |
As is known to all, one of the many benefits of ________ adventure travel is teaching children how to cope with ________ unexpected.
| A．the; / | B．/; an | C．the; the | D．/; the |