Time capsules（胶囊）are small collections of things or information that are stored（存储）somewhere safe．They can（1） 　　by people in many years and give future people a view of life in the past．

They may have newspaper articles，popular music recordings and photos．Historians can use time capsules to （2） 　　more about people that lived in the past．

One of （3） 　　time capslules was the Detroit Century Box．On December 31，1900，the city put several photos and letters in a box．The box wasn't opened （4） 　　people took it out on December 31，2000．

The things inside the capaule （5） 　　us a look at Deroit in the past．There （6） 　　photos of people and places，as well as letters written by local people．Some of them even made（7） 　　for the future．For example，one perscn predicted that Detroit would have a population of 4 million by 2000．But （8） 　　，the population of the city was 951，000 that year，according to historydetroit．com．

Humans have （9） 　　sent time capsules into space! The US sent two capsules into space on the Voyager spacecraft （航天器）in 1977． They're called the Voyager Golden Records． They contain （包含）sounds and pictures that show human life and culture． For example， they have（10） 　　by classical musician Beethoven and pictures of plants， insects and landscapes （风景）． The Voyager spacecraft has traveled far away from our solar system （太阳系）． It is hoped that aliens might find the time capsules some day and leam about humans．

（1）A．open	B．opened	C．be opened	D．be open
（2）A．change	B．learn	C．take	D．worry
（3）A．earliest	B．the earliest	C．the early	D．the earlier
（4）A．until	B．when	C．after	D．since
（5）A．thought	B．made	C．caught	D．gave
（6）A．was	B．are	C．were	D．will be
（7）A．questions	B．inventions	C．predictions	D．suggestions
（8）A．in fact	B．at first	C．in total	D．at last
（9）A．never	B．even	C．hardly	D．seldom
（10）A．sports	B．paintings	C．rock	D．music