1)i'd rather stay/to stay at home and go dance/dancing on saturday night. 2)my brother has been terrified/terrifying of rats since he was bitten by one as a child. 3)you know the staff at this hotel are/is always reaally polite and helpful. 4)mrs.crowder, who/whose is 60 works at leisure centre, where/when she teaches aerobics at classes which/who attract women of all ages.
2) terrified
3) are
4) who; where; which