英语问题，拜托了，请有百分百把握的童鞋来填啊啊啊啊啊~！

1.The girl was too frightened ( ) a word.
A.not to tell B.not to say C.to tell D.to say
2.Don't be afraid speak ( ),please! the teacher said( ).
A.loud;loud B.louder;loudly C.loudlier;loud D.alouder;loudly
3.
麻烦解释原因~！