Are these sentences correct?

This course will be as interesting as it iswill be educatioal. educational.
The function of pPunishments can be as detterent deterrent [as it is promted.] - no idea what you mean here.
Vivi works as carefully as she does quickly. (GOOD!)
I can't write egnlish English as well as I can speak it. ("can" is optional).
Obesity is a problem as important as canser. cancer. (Ok, but "serious" would be better than "important.")

or

Obesity is as serious a problem as cancer.

Are these sentences correct?

This course will be as interesting as it is educational . ok
The function of punishments is be a  deterrent, as it should
Vivi works as quickly and carefully as she normally does .
I can't write English as well as I can speak it.
Not being obese is as important to our health as our fear of  having cancer.