Here are the answers for the blanks, using the correct form of the verb 'to be':
I am kind.
You are silly.
Helen is smart.
Peter is brave.
We are friends.
She is happy.
Tom and Jerry are nice.
They are unlucky.
Bart is cute.
John and I are funny.
These sentences use the verb 'to be' (am, is, are) correctly for each subject. Remember:
* 'I' always uses 'am'
* Singular subjects (like 'Helen', 'Peter', 'She', 'Bart') use 'is'
* Plural subjects (like 'We', 'Tom and Jerry', 'They', 'John and I') use 'are'
* 'You' always uses 'are'