(2013·皖南八校第一次联考)A recent survey shows the number of people who shop in stores ________， while far more are shopping online.

Nobody in our class but Tom and I ___ that our monitor is going abroad for further education.

—Remember that where and when two different English question words___________. —I see, but can you tell us how to use them, sir?

There _______a big tree and some birds in the garden.

It’s difficult ______ this work today.