(1) May I lie on the sofa ? Would you mind ( )( (2) He insisted that I should go there. He insisted on ( )( ) on the sofa ? ) there. (3) There is no telling what will happen in the future. It is impossible ( ) ( ) what will happen in the future. (4) We couldn't go on a picnic because of the heavy rain. The heavy rain kept ( ) ( ) going on a picnic.