When you cross the street, you can never be _______ careful.

____ the search engine just gave me some brief introductions rather than the whole content of the book to read.

    Dream of the Red Chamber is ________worth ________because we can learn a    lot about the noble families in the feudal society.

---Thanks for your trouble. ---Not at all. I’m _____ pleased to help you.

---It is what parents say and do that really matters in children’s character training.--- _________.