-full and -less suffixes

The motorbike riders are being...

This pen is _______ because it ran out of ink!

Rhinos are very ______ animals!

I feel so ________ because I know I got a zero on my test!

Use the word careful in a sentence.

Use the word helpful in a sentence.

You're completely _______! You didn't help me at all!

Electric cars will be very ______ in the future, since you don't have to buy gas!