By the time I locked the door, I realized I ________ my keys at home.
| A．had repaired | B．had changed |
| C．had forgotten | D．had left |
--- Can you please tell me something about life in the future?
---Oh, maybe in the future, people will _______ by robots.
| A．cared for | B．be taken good care | C．be cared for | D．look after |
Scientists from different countries are trying to_______ a good way to solve the energy problem.
| A．keep up with | B．come up with | C．catch up with | D．meet up with |
--- Good news. Li Na has become the first woman to reach a Grand Slam final.
---Fantastic! Nothing sounds _________.
| A．good | B．best | C．better | D．worse |
We should wear special boots __________ us floating away into the space .
| A．to prevent | B．preventing | C．prevent | D．prevented |
---I’m too nervous to give a talk in front of so many people.
--- _________, Maria. I think you can make it.
| A．That’s true | B．With pleasure | C．Come on | D．You’re right |