Answer:
i. You should consider watching movies and tv shows in the language you want to learn better.
You could talk with natives online and/or offline.
ii. You should start exercising more than you did before.
It's a good idea to go to the doctor if the gain is uncontrollable.
iii. You should apologize to your teacher and convince her that you won't forget it the next time.
You could bring up an excuse.
iv. Use a pencil and tell your teacher/boss you didn't have a pen to write with.
Make a pdf and E-mail it to your teacher/boss.
v. You should consider asking your friends for help.
It's a good idea call the teacher and tell them about it.