语法填空
【小题1】The App WeChat provides a networking platform ________ communication is faster and easier.
【小题2】In some countries，many students participate in various programs, ________ they learn about the sense of responsibility by volunteering their services.
【小题3】RunningMan，is such funny reality show ________ has the gravity to pull you in front of your television.
【小题4】Overseas Chinese are particularly sought after for positions ________ a high degree or leadership is required.
【小题5】The old pictures bring them to the days ________ they spent together, ________ life was hard but happy.