Tony studies very ______.He often does his homework until 10:30p.m.,but his brother Tom______ does homework.
---What do you think of the film called So Young? --- I think this is the most wonderful film _______ I have ever seen.
--- Can you please tell me something about life in the future? ---Oh, maybe in the future, people will _______ by robots.
Scientists from different countries are trying to_______ a good way to solve the energy problem.
--- Good news. Li Na has become the first woman to reach a Grand Slam final. ---Fantastic! Nothing sounds _________.
We should wear special boots __________ us floating away into the space .