三个英语选择题.急It is _____ to think more of yourself than others,I

三个英语选择题.急
It is _____ to think more of yourself than others,I think.
A generous
B active
C selfish
D modest
It's _____ of you to tell the jokes.
A great funny
B very fun
C real fun
D very funny
I'll thank ____ Tom ______ his help
最后一个的选择
A 不填;for
B 不填;to
C for;for
D for;to