Every means ______ tried but without much result.

There is _______big desk in our classroom._______desk is for our teacher.

Has your father returned from Africa yet?—Yes,but he _______ here for only three days before his company sent him to Australia

Sorry to disturb you, ______ could I speak to you for a few minutes?

Would you mind ____ the window -Ofcourse not.I feel hot,too.