It's difficult ....................... chess well. a) playing b) to playing c) to play I'm determined ..................... my exams. a) passing b) to passing c) to pass I apologize ...................... at you. a) shouting b) for shouting c) for shout We're looking forward ......................... on holiday. a) going b) to going c) to go It's dangerous ....................... in that river. a) swimming b) to swimming c) to swim