Your help is _____ for the success of the project.

I’m sorry I’m late but I had a ____ tyre. — Never mind. Just go to your seat. [ ]

I won’t tell the student the answer to the math problem until he _____ on it for more than an hour.[ ]

I wore sports shoes to the ball yesterday evening by mistake!— Oh, dear, you must be very ____ at the ball!

Where’s my pen, Mum— ______ Is it on your desk