Mr. Li, a man calling himself Smith wants to see you. ________ he come in?

We would have called a taxi yesterday if Harold ________ us a ride home.

 Thank you for all your hard work last week. I don’t think we ______ it without you.

Without the timely aid from different provinces, the affected people in those areas ________ the difficulty.

It is vital that we _____ act out at once to protect the environment.