—Will you join us in the party this Saturday evening? —If I ____ ,I would ;but I will have left for Japan on business by then.
It never will rain roses. __________ we want to have more roses. we must plant trees.
I really don’t know _________ I put my wallet after I paid the bill.
During the examination we are required to stay in our seats, keep our eyes on our work, ____ to anyone.
________ these experiments were successfully completed would we think of going into humans.
Currently, many American women are still faced with the ________ of choosing between work and family commitments.