____ out how to put our furniture or we'll have to wait for another week to move in.
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.