Traveling through Ashdown Forest is great fun.I will never forget _______experience.

He is such ______! He is sure to ruin（毁坏）all the fun here if you invite him to the party.

It is comforting to see that ________， we are doing our part for the environment.

Are the new rules working —Yes. _______ books are stolen.

We’ll never give up_______ on the project no matter how difficult it is.