obsess
A. to process
B. to observe
C. to occupy
D. to absorb
attest
A. to prove
B. to arrest
C. to attend
D. to progress
cosmos
A. custom
B. system
C. universe
D. Course
slum
A. a piece of ground going up or down
B. a city area of dirty, poor living condition
C. an area of soft wet land
D. the entire tract of country drained by a river
微信支付 
支付宝支付