You can only be sure of _____ you have at present; you cannot be sure of something _____ you might get in the future.
Yourcoughought______beforeitgetsworse.
Jackson______toworkingovernmentofficethoughhehatedservingthere.
E-mail,aswellastelephones,______animportantpartindailycommunication.
—Bob,you______onthephone. —______.
Nothavingfinishedhishomework,______towatchTV.