根据释义词首字母写出单词。

1. i            have a favourable effect on sb.; make sb feel admiration and respect

2. i            cause sth. to become better

3. a            in a voice loud enough to be heard

4. f            annoying; discouraging

5. c            having all its parts; whole

铅笔规格中，B前面的数字越大，表示铅芯越软。H前面的数字越大，表示铅芯越硬，HB标号的铅芯硬软适中。