Вставьте глагол to be в правильной форме в Present Simpli переведите предложения Our economists ..... good specialists

1. Our economists are good specialists.

2. This question is difficult to answer.

3. Are you satisfied with my work?

4. Jack is  my elder brother.

5. I am ready to answer.

6. We are at the conference now.

7. They are famous for their pictures.

8. She is the best in our group.