Is Jack on duty today—It ________ be him. It’s his turntomorrow.

It took a long time for the connection between body temperature and illness ________.

A new _______to teaching English is being used here, and it has proven to be very helpful to the students.

Didn’t you see the sign “No Parking!” on the right— Sorry, I didn’t. But now I know parking _______ here.

The couple _____ last year. They had lived together for twenty years, though.