A campus emergency ______ occur at any time of the day or night, weekend, or holiday,

____ belongs to emergency power supplying equipments.A.Emergency fire pumpB.WindlassC.Main

After supper he ______ leisurely on the campus.A．strodeB．marchedC．ranD．strolled

________（47）A.He says there is emerging evidence

________（48）A.He says there is emerging evidence

________（49）A.He says there is emerging evidence

________（50）A.He says there is emerging evidence