I don’t think that your speech ____to the crowd, for they appeared quite puzzled.
31. —How much do you know about the 3D film technology? —A little. Not until ________ the hot movie Avatar ________ some about it.
30. In some countries, treatments for A(H1N1) flu were neither ________ nor effective, and many patients died because of infection.
29.For English teachers ________ a more effective role in teaching, they must make every effort to raise students’ cross-cultural awareness.
28. —Did you hear Tom was criticized for his spelling mistakes in his English composition? —Yes, but a more careful person ________ so many mistakes.
27.If you ________ to something different, for example to a different system, task, or subject of conversation, you change to it from what you were doing or saying before.