Attention, please! And keep ________ when I am taking a photograph of you.

—Jenny is always _______ for appointments. Why is she late today?—She might have got trapped in a traffic jam in the rush hour.

I am sorry, sir, but that kind of digital camera is no longer _______.

Tom was at a loss as to how a car worked, so it was ______ that he knew nothing about how to repair cars.

He is very popular among his students as he always tries to get them ________ in his lectures.