81:bbcac

82：dbcabc

gang,exhibition,disguised,arrested,keeping an eye on

83;abcaa

1.hight
2.South India
3.No,they didn't
4.
5.19 years

84:1.experiment
unfortunately
represent
companion
constant
reward
runner-up
blanket
associate
swap

B. 
disguised
broke into
got away with
arrested
made up
keep an eye on 
recovered
passed away
remarkable
documents

86;gdebhcaf

88:ddcdb

89;bddcac

rockets astronauts
conduct
launched
aboard

90:adbca

1~5:TFUFT

91:adefgbch

93:cdcbb

94:badadc

evening ,gouns,perfer,get rid of,start afresh

95:cbacd

calendar,start afresh,keep away,associated,costumes

96:hgefbadc

98:bcdcd

99:dbabdd

limited,an essay,experts,a waste of time, technology