—Can you come and give us a talk on Thursday or Friday?—I am afraid ______ day is possible. I am very busy these days.

We shouldn’t watch __________TV because it is bad for our eyes.

—Have you ___________ been to Beijing? —Yes. But only once.

— How often do you exercise? —            ever. Because I am very busy with my work.

 No matter what happens, the fact that Diaoyu Island belongs to China will ______ change.