Do you know when we can go back home? —Sorry, I don’t. Because of the heavy snow storm, highways have been blocked and flights have been __________.

Could you please show ____ your ticket?– Here you are.

This is the first time that we ____________a film in the newly-built cinema together.

Scientists say it may be five or six years _____ it is possible to test this medicine to human patients.

The woman asked the policeman where________.