Complete the sentences by changing the active modals to passive modals.

That book (should return)________________tomorrow.

This letter (must send)__________________today.

This package (could send)______________tomorrow.

That package (should send)____________by express mail.

That box (can put away)_______________now.

These boxes (may throw away)_____________soon.

Those boxes(might pick up)________________this afternoon.

This room(will clean up)_____________________soon.