1. Many difficulties ______（出现） in the course of their experiment，which was beyond our expectations.
2. There is another kind of beauty that has nothing to do with ______（外貌），but comes from the heart.
3. It was just her childhood experiences that affected her ______（性格） and later life.
4. Please ______（打字） this letter for me.
5. Let us ______（探索）the possibilities for improvement.
