1. I can’t find my keys anywhere—they’ve completely _______ (消失).
2. I ______(认为)that you knew each other because you went to the same school.
3. If any of these symptoms______(发生) while you are taking the medicine, consult your doctor immediately.
4. It’s not likely to happen but I wouldn’t rule out the ______ (可能性).
5. Is there any scientific _____(证据)that a person’s character is reflected in his handwriting?