should be returned
must be sent
could be sent
should be sent
can be put away
may be thrown away
might be picked up
will be cleaned up
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.