me how to do the role-play exercise?--sure. now let me tell you first.a which to do b how to do c when to do d what to do( ) 6 -- i came to your home yesterday afternoon, but nobody was in.--oh, we some shopping in the supermarket.a have done b did c were doing d are doing( ) 7 don t put off today s work for tomorrow. i mean, today s work today.a may do b must do c may be done d must be done( ) 8 when he got home last night, he his wife lying on the floor,a was finding; died b found; died c 