It is wrong for someone in such a high _____ in the government to behave too badly in public.

Now that there are only a few minutes left, we’d better talk about the plan in _____.

The scientific research on how to protect the rare animals is ________. Many scientists are working hard to find new way to raise the animals by man.

Their loving ____ was discovered by their parents.

I bought a sweater for only 50 yuan yesterday; it was a real        .