I am I wrong? (comparison degree)

1.                  The dog is … (big, bigger, biggest) than a rat.

1.                  I am the … (young, younger, youngest) in my family.

A pillow is … (soft, softer, softest) than a basketball

1.                  This house is … (smallest, small, smaller) than ours.

1.                  I am … (old, older, oldest) among those boys.

1.                  This book … (important, more important, most important) than that one.

1.                  I feel … (happy, happier, happiest) than i did yesterday.

1.                  This is … (bad, worse, worst) moment I have ever had.

1.                  That monster is the … (ugly, uglier, ugliest) thing I have ever seen.

1.                  This is the … (heavy, heavier, heaviest) bag of all.