A．twenties B．thirtiesC．forties D．teens

Over forty peopleparticipated in the study.A.ight B.Wrong C.Not mention

How many people have died？A．None.B．Twenty.C．Thousands.D．Millions.

How many minutes is the delay？A．Five.B．Fifteen.C．Twenty－five.D．Fifty.

A．Forty－five minutes.B．Over an hour.C．Less than ten minutes.D．About twenty minutes.

【C16】A．twentiesB．thirtiesC．fortiesD．teens

When is the conversation going on？A．Twenty days before Christmas Day.B．Twenty-three days b