②→ Playing golf gives people access to others they might not have met __.
offers
other
otherwise

③→ Playing golf gives both genders the opportunity to __ with both counterparts in a casual setting.

sociable
socialize
socializing 

④→  On the downside of things, playing golf is __.
cost
costly
costing

⑤→ 名古屋伏見英会話スクール ロケイシャス (LoQuacious) will have a golf __ in October.
competitive
competition
compensation