Brent san:

It sounds so stupid, indeed. (joodan desu)

We will have no class next week, March 13 and following week, March 20 is
Spring break.
We finished Lesson 6 and have one home work. Please see the attachment.

Don't be stupid and see you on March 27th.

Izumi sensei

The attachment basically instructs me to look at a series of sketches in the textbook and think up a dialogue for each one.

AFAICT, "joodan desu" means "I'm joking", which is a Good Thing. :^)