If they make a good offer, I ______ the house. (will buy / buy)
will buy
If the people don't come, we ______ to cancel the party. (will have / have)
will have
He'll try to get money from you if he ______ you've won the lottery. (knows / will know)
knows
He won't ask for help unless it _______ absolutely necessary. (is / will be)
is
