The driver has much experience of driving, and _____ he behaved very calmly in the dangerous situation.

I hear someone _______at the door. Please go and see who _______ is.

k he is _____ to tell us the secret,but I’m not sure.

We students are supposed to know how we shouldourselves tosurewe are in the proper mental state.

You _______ pay too much attention to your reading skills, as it is so important.